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aus+uk / uk.d-i-y / Re: OT: mpg question

SubjectAuthor
* OT: mpg questionScott
+* Re: OT: mpg questionClive Arthur
|+- Re: OT: mpg questionTim Lamb
|+* Re: OT: mpg questionThe Natural Philosopher
||`* Re: OT: mpg questionScott
|| +* Re: OT: mpg questionNY
|| |+* Re: OT: mpg questionalan_m
|| ||+* Re: OT: mpg questionNY
|| |||+* Re: OT: mpg questionScott
|| ||||`- Re: OT: mpg questionTim+
|| |||`* Re: OT: mpg questionmm0fmf
|| ||| `* Re: OT: mpg questionAndy Burns
|| |||  +- Re: OT: mpg questionThe Natural Philosopher
|| |||  `* Re: OT: mpg questionAndrew
|| |||   `* Re: OT: mpg questionTim Streater
|| |||    `* Re: OT: mpg questionTim+
|| |||     `* Re: OT: mpg questionAndrew
|| |||      +* Re: OT: mpg questionTim Streater
|| |||      |`* Re: OT: mpg questionNY
|| |||      | `* Re: OT: mpg questionAnimal
|| |||      |  `* Re: OT: mpg questionlacksey
|| |||      |   `* Re: OT: mpg questionThe Natural Philosopher
|| |||      |    +* Re: OT: mpg questionlacksey
|| |||      |    |`* Re: OT: mpg questionAnimal
|| |||      |    | `- Re: OT: mpg questionlacksey
|| |||      |    `* Re: OT: mpg questionNY
|| |||      |     +* Re: OT: mpg questionThe Natural Philosopher
|| |||      |     |`* Re: OT: mpg questionTurnip Fucker
|| |||      |     | `* Re: OT: mpg questionThe Natural Philosopher
|| |||      |     |  `* Re: OT: mpg questionTurnip Fucker
|| |||      |     |   `* Re: OT: mpg questionFredxx
|| |||      |     |    `* Re: OT: mpg questionTurnip Fucker
|| |||      |     |     `* Re: OT: mpg questionFredxx
|| |||      |     |      `* Re: OT: mpg questionTurnip Fucker
|| |||      |     |       `* Re: OT: mpg questionFredxx
|| |||      |     |        `- Re: OT: mpg questionTurnip Fucker
|| |||      |     `- Re: OT: mpg questionRod Speed
|| |||      +- Re: OT: mpg questionmm0fmf
|| |||      `- Re: OT: mpg questionBrian D
|| ||`* Re: OT: mpg questionAndrew
|| || `- Re: OT: mpg questionScott
|| |`* Re: OT: mpg questionTim Streater
|| | +* Re: OT: mpg questionNY
|| | |`- Re: OT: mpg questionTim Streater
|| | `* Re: OT: mpg questionPaul
|| |  `* Re: OT: mpg questionTim Streater
|| |   `- Re: OT: mpg questionScott
|| `- Re: OT: mpg questionalan_m
|`* Re: OT: mpg questionHarry Bloomfield Esq
| `* Re: OT: mpg questionTim+
|  +* Re: OT: mpg questionTim Streater
|  |`* Re: OT: mpg questionFredxx
|  | `- Re: OT: mpg questionThe Natural Philosopher
|  +* Re: OT: mpg questionRichard
|  |`* Re: OT: mpg questionClive Arthur
|  | +* Re: OT: mpg questionRichard
|  | |`* Re: OT: mpg questionNY
|  | | `* Re: OT: mpg questionRichard
|  | |  `* Re: OT: mpg questionNY
|  | |   `* Re: OT: mpg questionRichard
|  | |    +* Re: OT: mpg questionRobin
|  | |    |`- Re: OT: mpg questionRichard
|  | |    `- Re: OT: mpg questionNY
|  | `- Re: OT: mpg questionAndrew
|  `* Re: OT: mpg questionAndrew
|   `- Re: OT: mpg questionTim+
+* Re: OT: mpg questionJeff Gaines
|+- Re: OT: mpg questionThe Natural Philosopher
|`- Re: OT: mpg questionAnthonyL
+* Re: OT: mpg questionPeter Johnson
|`* Re: OT: mpg questionwilliamwright
| +- Re: OT: mpg questionJeff Gaines
| +* Re: OT: mpg questionmm0fmf
| |`* Re: OT: mpg questionSH
| | +- Re: OT: mpg questionRod Speed
| | `* Re: OT: mpg questionAnimal
| |  `- Re: OT: mpg questionAnimal
| `* Re: OT: mpg questionSH
|  `- Re: OT: mpg questionARW
+* Re: OT: mpg questionJethro_uk
|+* Re: OT: mpg questionalan_m
||+* Re: OT: mpg questionJethro_uk
|||+- Re: OT: mpg questionalan_m
|||`- Re: OT: mpg questionThe Natural Philosopher
||`* Re: OT: mpg questionRod Speed
|| `* Re: OT: mpg questionNY
||  +* Re: OT: mpg questionRod Speed
||  |`* Re: OT: mpg questionNY
||  | +* Re: OT: mpg questionTim Streater
||  | |`* Re: OT: mpg questionNY
||  | | `- Re: OT: mpg questionTim Streater
||  | `- Re: OT: mpg questionRod Speed
||  `- Re: OT: mpg questionThe Natural Philosopher
|+* Re: OT: mpg questionThe Natural Philosopher
||`- Re: OT: mpg questionJethro_uk
|+* Re: OT: mpg questionARW
||`- Re: OT: mpg questionJethro_uk
|`* Re: OT: mpg questionVir Campestris
| `- Re: OT: mpg questionlacksey
+* Re: OT: mpg questionMartin Brown
|`* Re: OT: mpg questionFredxx
+- Re: OT: mpg questionJim Stewart ...
+* Re: OT: mpg questionlacksey
+* Re: OT: mpg questionARW
`* Re: OT: mpg questionMike Rogers

Pages:123456
OT: mpg question

<7lsu7h9eb2k80alhu2omghva4ssnttjok6@4ax.com>

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From: newsgro...@gefion.myzen.co.uk (Scott)
Newsgroups: uk.d-i-y
Subject: OT: mpg question
Date: Sat, 14 May 2022 10:20:53 +0100
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 by: Scott - Sat, 14 May 2022 09:20 UTC

I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
the drive computer at the start. On the way north, I was running late
and driving a bit faster than usual. I also got caught in a traffic
jam on the M8. When I arrived I checked the display and it showed
52.5 mpg. l reset the drive computer before returning. I drove more
slowly on the way home, without the traffic jam, and got 48.8 mpg.

Nissan Micra 1.2. Petrol. Manual gearbox, five gears.

How can this be? I thought slowing down saved fuel. The only
explanation I can think of is that I may have been driving into the
wind on the way south. Could this account for the variation?

Re: OT: mpg question

<t5ntgp$sf8$1@dont-email.me>

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From: cli...@nowaytoday.co.uk (Clive Arthur)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 10:41:43 +0100
Organization: A noiseless patient Spider
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 by: Clive Arthur - Sat, 14 May 2022 09:41 UTC

On 14/05/2022 10:20, Scott wrote:
> I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
> the drive computer at the start. On the way north, I was running late
> and driving a bit faster than usual. I also got caught in a traffic
> jam on the M8. When I arrived I checked the display and it showed
> 52.5 mpg. l reset the drive computer before returning. I drove more
> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>
> Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>
> How can this be? I thought slowing down saved fuel. The only
> explanation I can think of is that I may have been driving into the
> wind on the way south. Could this account for the variation?

Much the same happened to me on a longer trip of 260 miles which I'd
done a few times. Yes, I'm pretty sure it's the wind that makes the
difference.

--
Cheers
Clive

Re: OT: mpg question

<8LFEySEqS4fiFwNc@marfordfarm.demon.co.uk>

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From: tim...@marfordfarm.demon.co.uk (Tim Lamb)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 11:30:02 +0100
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 by: Tim Lamb - Sat, 14 May 2022 10:30 UTC

In message <t5ntgp$sf8$1@dont-email.me>, Clive Arthur
<clive@nowaytoday.co.uk> writes
>On 14/05/2022 10:20, Scott wrote:
>> I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
>> the drive computer at the start. On the way north, I was running late
>> and driving a bit faster than usual. I also got caught in a traffic
>> jam on the M8. When I arrived I checked the display and it showed
>> 52.5 mpg. l reset the drive computer before returning. I drove more
>> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>> Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>> How can this be? I thought slowing down saved fuel. The only
>> explanation I can think of is that I may have been driving into the
>> wind on the way south. Could this account for the variation?
>
>Much the same happened to me on a longer trip of 260 miles which I'd
>done a few times. Yes, I'm pretty sure it's the wind that makes the
>difference.
A pair of wing mirrors was once measured as using 2bhp at 60mph.
>

--
Tim Lamb

Re: OT: mpg question

<t5o15h$4hm$1@dont-email.me>

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From: tnp...@invalid.invalid (The Natural Philosopher)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 11:44:00 +0100
Organization: A little, after lunch
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 by: The Natural Philosop - Sat, 14 May 2022 10:44 UTC

On 14/05/2022 10:41, Clive Arthur wrote:
> On 14/05/2022 10:20, Scott wrote:
>> I drove to Perth yesterday (Scotland not Australia), 62 miles.  I set
>> the drive computer at the start.  On the way north, I was running late
>> and driving a bit faster than usual.  I also got caught in a traffic
>> jam on the M8.  When I arrived I checked the display and it showed
>> 52.5 mpg.  l reset the drive computer before returning.  I drove more
>> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>>
>> Nissan Micra 1.2.  Petrol.  Manual gearbox, five gears.
>>
>> How can this be?  I thought slowing down saved fuel.  The only
>> explanation I can think of is that I may have been driving into the
>> wind on the way south.  Could this account for the variation?
>
> Much the same happened to me on a longer trip of 260 miles which I'd
> done a few times.  Yes, I'm pretty sure it's the wind that makes the
> difference.
>
drag is proportional to airspeed squared. Drag times distance is energy
lost to drag. Over 50mph most of the energy loss is drag.
I cant be arsed to work out actual numbers, but its moire than plausible.

I remember many years ago my Triumph Spitfire - which used to do about
35mpg, had to make a 90 mile drive over fresh snow on new years very
early day. Any heavy throttle or brakes sent the car sideways. I made
it, never more than 50mph, and clocked over 50mpg...

Before that a friend had some old Hillman and we drove North with a
following wind at never more than 55mph, and south again into the wind.
Again the mpg was significantly different.

--
“It is dangerous to be right in matters on which the established
authorities are wrong.”

― Voltaire, The Age of Louis XIV

Re: OT: mpg question

<xn0nhutym313rw900b@news.individual.net>

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From: jgaines_...@yahoo.co.uk (Jeff Gaines)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: 14 May 2022 11:01:29 GMT
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 by: Jeff Gaines - Sat, 14 May 2022 11:01 UTC

On 14/05/2022 in message <7lsu7h9eb2k80alhu2omghva4ssnttjok6@4ax.com>
Scott wrote:

>I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
>the drive computer at the start. On the way north, I was running late
>and driving a bit faster than usual. I also got caught in a traffic
>jam on the M8. When I arrived I checked the display and it showed
>52.5 mpg. l reset the drive computer before returning. I drove more
>slowly on the way home, without the traffic jam, and got 48.8 mpg.
>
>Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>
>How can this be? I thought slowing down saved fuel. The only
>explanation I can think of is that I may have been driving into the
>wind on the way south. Could this account for the variation?

North is up hill all the way, South is down hill.

--
Jeff Gaines Dorset UK
There are 10 types of people in the world, those who do binary and those
who don't.

Re: OT: mpg question

<qj3v7hth0loh4r8u1uilevah8crccpq0g9@4ax.com>

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From: newsgro...@gefion.myzen.co.uk (Scott)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 12:13:17 +0100
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 by: Scott - Sat, 14 May 2022 11:13 UTC

On Sat, 14 May 2022 11:44:00 +0100, The Natural Philosopher
<tnp@invalid.invalid> wrote:

>On 14/05/2022 10:41, Clive Arthur wrote:
>> On 14/05/2022 10:20, Scott wrote:
>>> I drove to Perth yesterday (Scotland not Australia), 62 miles.  I set
>>> the drive computer at the start.  On the way north, I was running late
>>> and driving a bit faster than usual.  I also got caught in a traffic
>>> jam on the M8.  When I arrived I checked the display and it showed
>>> 52.5 mpg.  l reset the drive computer before returning.  I drove more
>>> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>>>
>>> Nissan Micra 1.2.  Petrol.  Manual gearbox, five gears.
>>>
>>> How can this be?  I thought slowing down saved fuel.  The only
>>> explanation I can think of is that I may have been driving into the
>>> wind on the way south.  Could this account for the variation?
>>
>> Much the same happened to me on a longer trip of 260 miles which I'd
>> done a few times.  Yes, I'm pretty sure it's the wind that makes the
>> difference.
>>
>drag is proportional to airspeed squared. Drag times distance is energy
>lost to drag. Over 50mph most of the energy loss is drag.
>I cant be arsed to work out actual numbers, but its moire than plausible.
>
>I remember many years ago my Triumph Spitfire - which used to do about
>35mpg, had to make a 90 mile drive over fresh snow on new years very
>early day. Any heavy throttle or brakes sent the car sideways. I made
>it, never more than 50mph, and clocked over 50mpg...
>
>Before that a friend had some old Hillman and we drove North with a
>following wind at never more than 55mph, and south again into the wind.
>Again the mpg was significantly different.

My friend got it to 60 mpg with some very skilful and cautious driving
away from motorways. .

Re: OT: mpg question

<t5o3qc$l67$1@dont-email.me>

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From: me...@privacy.invalid (NY)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 12:29:05 +0100
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 by: NY - Sat, 14 May 2022 11:29 UTC

"Scott" <newsgroups@gefion.myzen.co.uk> wrote in message
news:qj3v7hth0loh4r8u1uilevah8crccpq0g9@4ax.com...
>>Before that a friend had some old Hillman and we drove North with a
>>following wind at never more than 55mph, and south again into the wind.
>>Again the mpg was significantly different.
>
> My friend got it to 60 mpg with some very skilful and cautious driving
> away from motorways.

My car (Peugeot 308 with a diesel engine) was the subject of a
well-publicised tour around the UK by two "feather-footed" drivers who tried
to use as little fuel as possible. They apparently averaged 90 mpg. I think
I tend to drive fairly economically (gentle acceleration, keep to speed
limits, lift off power early to lose speed rather than driving right up to a
junction and then braking hard). But the best I've averaged on a tankful of
fuel is about 60 mpg - and that may partly have been due to random filling
differences (different pumps cut out at different points). The average over
about 170,000 miles (*) is 54 mpg. It's possible that the car used for the
record had a less powerful engine (if that makes it more efficient) and I
couldn't find any mention of whether the drivers had a lower self-imposed
maximum speed to use less fuel. Maybe they only did each leg of the journey
on a day that the wind was predominantly behind them ;-)

(*) Mainly motorway, A road and country lanes, but almost no stop-start in
heavy traffic.

Re: OT: mpg question

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From: tnp...@invalid.invalid (The Natural Philosopher)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 13:24:56 +0100
Organization: A little, after lunch
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 by: The Natural Philosop - Sat, 14 May 2022 12:24 UTC

On 14/05/2022 12:01, Jeff Gaines wrote:
> On 14/05/2022 in message <7lsu7h9eb2k80alhu2omghva4ssnttjok6@4ax.com>
> Scott wrote:
>
>> I drove to Perth yesterday (Scotland not Australia), 62 miles.  I set
>> the drive computer at the start.  On the way north, I was running late
>> and driving a bit faster than usual.  I also got caught in a traffic
>> jam on the M8.  When I arrived I checked the display and it showed
>> 52.5 mpg.  l reset the drive computer before returning.  I drove more
>> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>>
>> Nissan Micra 1.2.  Petrol.  Manual gearbox, five gears.
>>
>> How can this be?  I thought slowing down saved fuel.  The only
>> explanation I can think of is that I may have been driving into the
>> wind on the way south.  Could this account for the variation?
>
> North is up hill all the way, South is down hill.
>
well its actually the other way, north is down wind and south is into
the wind. which was around 20mph+ yesterday and broadly southerly

--
If you tell a lie big enough and keep repeating it, people will
eventually come to believe it. The lie can be maintained only for such
time as the State can shield the people from the political, economic
and/or military consequences of the lie. It thus becomes vitally
important for the State to use all of its powers to repress dissent, for
the truth is the mortal enemy of the lie, and thus by extension, the
truth is the greatest enemy of the State.

Joseph Goebbels

Re: OT: mpg question

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From: nos...@please.invalid (AnthonyL)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 12:27:36 GMT
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 by: AnthonyL - Sat, 14 May 2022 12:27 UTC

On 14 May 2022 11:01:29 GMT, "Jeff Gaines"
<jgaines_newsid@yahoo.co.uk> wrote:

>On 14/05/2022 in message <7lsu7h9eb2k80alhu2omghva4ssnttjok6@4ax.com>
>Scott wrote:
>
>>I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
>>the drive computer at the start. On the way north, I was running late
>>and driving a bit faster than usual. I also got caught in a traffic
>>jam on the M8. When I arrived I checked the display and it showed
>>52.5 mpg. l reset the drive computer before returning. I drove more
>>slowly on the way home, without the traffic jam, and got 48.8 mpg.
>>
>>Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>>
>>How can this be? I thought slowing down saved fuel. The only
>>explanation I can think of is that I may have been driving into the
>>wind on the way south. Could this account for the variation?
>
>North is up hill all the way, South is down hill.
>

I turn my map through 180deg when going North. Saves a small fortune.

--
AnthonyL

Why ever wait to finish a job before starting the next?

Re: OT: mpg question

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From: jun...@admac.myzen.co.uk (alan_m)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
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 by: alan_m - Sat, 14 May 2022 12:45 UTC

On 14/05/2022 12:13, Scott wrote:

>
> My friend got it to 60 mpg with some very skilful and cautious driving
> away from motorways. .

I find motorways give me the best mileage - no corners or winding lanes.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

Re: OT: mpg question

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From: pet...@parksidewood.nospam (Peter Johnson)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 13:47:51 +0100
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 by: Peter Johnson - Sat, 14 May 2022 12:47 UTC

In March I drove from Woking to Leicester in a Prius. Before leaving,
the Satnav said the distance was 118 miles and the trip computer
estimated the range available to be also 118 miles.
Reaching the M1 I tucked in behind a sequence of HGVs and made the
journey at 60-65mph. Reached home with an estimated 5 miles range
still available.

Re: OT: mpg question

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From: jun...@admac.myzen.co.uk (alan_m)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
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 by: alan_m - Sat, 14 May 2022 12:48 UTC

On 14/05/2022 12:29, NY wrote:

> It's possible that the car used for the record had a less powerful
> engine (if that makes it more efficient) and I couldn't find any mention
> of whether the drivers had a lower self-imposed maximum speed to use
> less fuel. Maybe they only did each leg of the journey on a day that the
> wind was predominantly behind them ;-)
>

Or all unnecessary weight removed from the vehicle. No spare wheel, no
luggage, no back seat etc.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

Re: OT: mpg question

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From: jethro...@hotmailbin.com (Jethro_uk)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 12:56:21 -0000 (UTC)
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 by: Jethro_uk - Sat, 14 May 2022 12:56 UTC

On Sat, 14 May 2022 10:20:53 +0100, Scott wrote:

> I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
> the drive computer at the start. On the way north, I was running late
> and driving a bit faster than usual. I also got caught in a traffic jam
> on the M8. When I arrived I checked the display and it showed 52.5 mpg.
> l reset the drive computer before returning. I drove more slowly on
> the way home, without the traffic jam, and got 48.8 mpg.
>
> Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>
> How can this be? I thought slowing down saved fuel. The only
> explanation I can think of is that I may have been driving into the wind
> on the way south. Could this account for the variation?

Depends on loads of things, not least the envelope where the engine
produces the most efficient output - usually c. 3000-3500 rpm for petrol.

I once saved 25% on a 100 mile journey by doing 55 instead of 75.

You can tell how much of this climate "emergency" is bollocks from the
fact that a rigidly enforced 65mph limit on motorways would save the UK
quite a bit in fuel consumption. (Although not as much as not travelling
at all).

Re: OT: mpg question

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From: jun...@admac.myzen.co.uk (alan_m)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
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 by: alan_m - Sat, 14 May 2022 13:17 UTC

On 14/05/2022 13:56, Jethro_uk wrote:

> You can tell how much of this climate "emergency" is bollocks from the
> fact that a rigidly enforced 65mph limit on motorways would save the UK
> quite a bit in fuel consumption. (Although not as much as not travelling
> at all).

I guess that a lot of people who think they are doing 70mph are actually
doing 63 to 65mph because most speedometers read 10% high.

Risk of accident wise, boredom on a long motorway journey is possibly a
higher risk than speed.

--
mailto : news {at} admac {dot} myzen {dot} co {dot} uk

Re: OT: mpg question

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From: timstrea...@greenbee.net (Tim Streater)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: 14 May 2022 13:19:48 GMT
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 by: Tim Streater - Sat, 14 May 2022 13:19 UTC

On 14 May 2022 at 12:29:05 BST, "NY" <me@privacy.invalid> wrote:

> But the best I've averaged on a tankful of fuel is about 60 mpg - and that may
> partly have been due to random filling differences (different pumps cut out at
> different points).

Just pull the nozzle out a bit and continue to fill - carefully. I usually
manage to get 2 litres more in, doing that.
--
There is nothing a fleet of dispatchable nuclear power plants cannot do that cannot be done worse and more expensively and with higher carbon emissions and more adverse environmental impact by adding intermittent renewable energy.

Re: OT: mpg question

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From: '''newsp...@nonad.co.uk (Martin Brown)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 14:22:27 +0100
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 by: Martin Brown - Sat, 14 May 2022 13:22 UTC

On 14/05/2022 10:20, Scott wrote:
> I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
> the drive computer at the start. On the way north, I was running late
> and driving a bit faster than usual. I also got caught in a traffic
> jam on the M8. When I arrived I checked the display and it showed
> 52.5 mpg. l reset the drive computer before returning. I drove more
> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>
> Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>
> How can this be? I thought slowing down saved fuel. The only
> explanation I can think of is that I may have been driving into the
> wind on the way south. Could this account for the variation?

Depends on the wind speed but yes it could easily make the difference
since the drag is proportional to the square of the speed that the air
is going past your car. If you have the wind behind you then you
actually get less drag than in still air and into a headwind more.

to Perth = k(V-v)^2
from Perth = k(V+v)^2

--
Regards,
Martin Brown

Re: OT: mpg question

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 by: williamwright - Sat, 14 May 2022 13:43 UTC

On 14/05/2022 13:47, Peter Johnson wrote:
> In March I drove from Woking to Leicester in a Prius. Before leaving,
> the Satnav said the distance was 118 miles and the trip computer
> estimated the range available to be also 118 miles.
> Reaching the M1 I tucked in behind a sequence of HGVs and made the
> journey at 60-65mph. Reached home with an estimated 5 miles range
> still available.

The increases in fuel costs don't affect me because I always put exactly
£30's worth in.

Bill

Re: OT: mpg question

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From: me...@privacy.invalid (NY)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
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 by: NY - Sat, 14 May 2022 14:00 UTC

"alan_m" <junk@admac.myzen.co.uk> wrote in message
news:je9mofFqrsnU1@mid.individual.net...
> On 14/05/2022 12:29, NY wrote:
>
>> It's possible that the car used for the record had a less powerful engine
>> (if that makes it more efficient) and I couldn't find any mention of
>> whether the drivers had a lower self-imposed maximum speed to use less
>> fuel. Maybe they only did each leg of the journey on a day that the wind
>> was predominantly behind them ;-)
>
> Or all unnecessary weight removed from the vehicle. No spare wheel, no
> luggage, no back seat etc.

And maybe only put in a small amount of fuel and keep filling up, to reduce
the weight of fuel. 60 litres of diesel weighs about 50 kg which is about
half a person (OK, half a fairly heavy person like wot I am).

My grandpa had lived through fuel rationing in the war and had been taught
how to conserve fuel for the times when he was making an authorised journey.
It's ironic that his technique of slipping into neutral as he was slowing
down (which he still did to the day he stopped driving shortly before he
died in 1999) would actually be counterproductive with a modern
computer-controlled engine. I've proved it with the instantaneous
fuel-consumption menu on my car: pressing the clutch and keeping the engine
idling uses a measurable amount of fuel (which displays as around about 150
mpg) whereas lifting off the throttle and staying in gear (ie clutch not
pressed) uses a mythical 999 mpg. That's because the computer can cut the
fuel *totally* if the motion of the car on overrun will keep the engine
turning, whereas with the car in neutral (or clutch pressed) a token amount
of fuel is needed to keep the engine ticking over.

Re: OT: mpg question

<2vdv7hpe61q6l7ird65fdpp9272a0k5lj6@4ax.com>

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From: newsgro...@gefion.myzen.co.uk (Scott)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 15:10:12 +0100
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 by: Scott - Sat, 14 May 2022 14:10 UTC

On Sat, 14 May 2022 15:00:20 +0100, "NY" <me@privacy.invalid> wrote:

>"alan_m" <junk@admac.myzen.co.uk> wrote in message
>news:je9mofFqrsnU1@mid.individual.net...
>> On 14/05/2022 12:29, NY wrote:
>>
>>> It's possible that the car used for the record had a less powerful engine
>>> (if that makes it more efficient) and I couldn't find any mention of
>>> whether the drivers had a lower self-imposed maximum speed to use less
>>> fuel. Maybe they only did each leg of the journey on a day that the wind
>>> was predominantly behind them ;-)
>>
>> Or all unnecessary weight removed from the vehicle. No spare wheel, no
>> luggage, no back seat etc.
>
>And maybe only put in a small amount of fuel and keep filling up, to reduce
>the weight of fuel. 60 litres of diesel weighs about 50 kg which is about
>half a person (OK, half a fairly heavy person like wot I am).
>
>My grandpa had lived through fuel rationing in the war and had been taught
>how to conserve fuel for the times when he was making an authorised journey.
>It's ironic that his technique of slipping into neutral as he was slowing
>down (which he still did to the day he stopped driving shortly before he
>died in 1999) would actually be counterproductive with a modern
>computer-controlled engine. I've proved it with the instantaneous
>fuel-consumption menu on my car: pressing the clutch and keeping the engine
>idling uses a measurable amount of fuel (which displays as around about 150
>mpg) whereas lifting off the throttle and staying in gear (ie clutch not
>pressed) uses a mythical 999 mpg. That's because the computer can cut the
>fuel *totally* if the motion of the car on overrun will keep the engine
>turning, whereas with the car in neutral (or clutch pressed) a token amount
>of fuel is needed to keep the engine ticking over.

Interesting. I never knew that. I was taught to move into neutral in
advance of the stop and coast to save fuel but when I did the Advanced
Driving course, I was told the opposite (in gear at all times when
moving).

Re: OT: mpg question

<t5oe0s$ptj$1@dont-email.me>

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From: kinvig.n...@ntlworld.com (Jim Stewart ...)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 15:23:23 +0100
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 by: Jim Stewart ... - Sat, 14 May 2022 14:23 UTC

On 14/05/2022 10:20, Scott wrote:
> I drove to Perth yesterday (Scotland not Australia), 62 miles. I set
> the drive computer at the start. On the way north, I was running late
> and driving a bit faster than usual. I also got caught in a traffic
> jam on the M8. When I arrived I checked the display and it showed
> 52.5 mpg. l reset the drive computer before returning. I drove more
> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>
> Nissan Micra 1.2. Petrol. Manual gearbox, five gears.
>
> How can this be? I thought slowing down saved fuel. The only
> explanation I can think of is that I may have been driving into the
> wind on the way south. Could this account for the variation?
never rely on a car computer

Re: OT: mpg question

<t5oedo$sst$1@dont-email.me>

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From: me...@privacy.invalid (NY)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 15:21:01 +0100
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 by: NY - Sat, 14 May 2022 14:21 UTC

"Tim Streater" <timstreater@greenbee.net> wrote in message
news:je9ojkFr684U1@mid.individual.net...
> On 14 May 2022 at 12:29:05 BST, "NY" <me@privacy.invalid> wrote:
>
>> But the best I've averaged on a tankful of fuel is about 60 mpg - and
>> that may
>> partly have been due to random filling differences (different pumps cut
>> out at
>> different points).
>
> Just pull the nozzle out a bit and continue to fill - carefully. I usually
> manage to get 2 litres more in, doing that.

I tend to let the pump cutoff, try again, cutoff - and regard that as
"full".

But I'm well aware that there is quite a lot of variation in the cutoff
points of different pumps. I once did three consecutive tankfulls, filling
up at the same pump each time (at my local garage) and the consumption
figures were more consistent than for other tankfuls which had been filled
at a variety of pumps/garages. That suggests that the variation in driving
conditions from one tankful to the next can sometimes be less than the
variation in cutoff from one pump to another - which surprised me. I did
have a reading which was very suspect: dramatically better mpg on one
tankful followed by dramatically worse for the next tankful which makes me
think that one pump cutoff way before my tank was full.

But in general, a lot of driving on country lanes, slowing down for lots of
bends and then accelerating back to a typical straight-line speed in
between, will use more fuel than a constant 70 on a motorway, which in turn
will use more than a fairly constant 50-60 on a free-running A road. Town
driving - lots of short journeys, lots of stop/start at T junctions and
traffic lights, uses dramatically more.

Re: OT: mpg question

<xn0nhuzjt38rg1d00d@news.individual.net>

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From: jgaines_...@yahoo.co.uk (Jeff Gaines)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: 14 May 2022 14:35:50 GMT
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 by: Jeff Gaines - Sat, 14 May 2022 14:35 UTC

On 14/05/2022 in message <je9pviFregbU1@mid.individual.net> williamwright
wrote:

>On 14/05/2022 13:47, Peter Johnson wrote:
>>In March I drove from Woking to Leicester in a Prius. Before leaving,
>>the Satnav said the distance was 118 miles and the trip computer
>>estimated the range available to be also 118 miles.
>>Reaching the M1 I tucked in behind a sequence of HGVs and made the
>>journey at 60-65mph. Reached home with an estimated 5 miles range
>>still available.
>
>The increases in fuel costs don't affect me because I always put exactly
>£30's worth in.
>
>Bill

Absolutely :-)

Manufacturers are helping as well. When I bought my car the tank held £35
of petrol, they must have changed the tank at the last service as it now
holds £65 worth!

--
Jeff Gaines Dorset UK
There are 10 types of people in the world, those who do binary and those
who don't.

Re: OT: mpg question

<t5ogo8$dbb$1@dont-email.me>

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From: fre...@spam.uk (Fredxx)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 16:10:00 +0100
Organization: A noiseless patient Spider
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 by: Fredxx - Sat, 14 May 2022 15:10 UTC

On 14/05/2022 14:22, Martin Brown wrote:
> On 14/05/2022 10:20, Scott wrote:
>> I drove to Perth yesterday (Scotland not Australia), 62 miles.  I set
>> the drive computer at the start.  On the way north, I was running late
>> and driving a bit faster than usual.  I also got caught in a traffic
>> jam on the M8.  When I arrived I checked the display and it showed
>> 52.5 mpg.  l reset the drive computer before returning.  I drove more
>> slowly on the way home, without the traffic jam, and got 48.8 mpg.
>>
>> Nissan Micra 1.2.  Petrol.  Manual gearbox, five gears.
>>
>> How can this be?  I thought slowing down saved fuel.  The only
>> explanation I can think of is that I may have been driving into the
>> wind on the way south.  Could this account for the variation?
>
> Depends on the wind speed but yes it could easily make the difference
> since the drag is proportional to the square of the speed that the air
> is going past your car. If you have the wind behind you then you
> actually get less drag than in still air and into a headwind more.
>
> to Perth =  k(V-v)^2
> from Perth = k(V+v)^2

Shouldn't that be a cubic function of wind speed?

http://drømstørre.dk/wp-content/wind/miller/windpower%20web/en/tour/wres/enrspeed.htm

Your engine power will be (wind speed)^4

Of course for petrol cars part throttle economy will be poor.

Re: OT: mpg question

<jea0u9Fso2iU1@mid.individual.net>

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From: timstrea...@greenbee.net (Tim Streater)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: 14 May 2022 15:42:01 GMT
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 by: Tim Streater - Sat, 14 May 2022 15:42 UTC

On 14 May 2022 at 15:21:01 BST, "NY" <me@privacy.invalid> wrote:

> "Tim Streater" <timstreater@greenbee.net> wrote in message
> news:je9ojkFr684U1@mid.individual.net...
>> On 14 May 2022 at 12:29:05 BST, "NY" <me@privacy.invalid> wrote:
>>
>>> But the best I've averaged on a tankful of fuel is about 60 mpg - and
>>> that may
>>> partly have been due to random filling differences (different pumps cut
>>> out at
>>> different points).
>>
>> Just pull the nozzle out a bit and continue to fill - carefully. I usually
>> manage to get 2 litres more in, doing that.
>
> I tend to let the pump cutoff, try again, cutoff - and regard that as
> "full".
>
> But I'm well aware that there is quite a lot of variation in the cutoff
> points of different pumps. I once did three consecutive tankfulls, filling
> up at the same pump each time (at my local garage) and the consumption
> figures were more consistent than for other tankfuls which had been filled
> at a variety of pumps/garages. That suggests that the variation in driving
> conditions from one tankful to the next can sometimes be less than the
> variation in cutoff from one pump to another - which surprised me. I did
> have a reading which was very suspect: dramatically better mpg on one
> tankful followed by dramatically worse for the next tankful which makes me
> think that one pump cutoff way before my tank was full.

The reason I do it my way is so that I get a more accurate consumption figure
when I enter the numbers on my spreadsheet. No effort for me as SWMBO fills
the fuel book.

> But in general, a lot of driving on country lanes, slowing down for lots of
> bends and then accelerating back to a typical straight-line speed in
> between, will use more fuel than a constant 70 on a motorway, which in turn
> will use more than a fairly constant 50-60 on a free-running A road. Town
> driving - lots of short journeys, lots of stop/start at T junctions and
> traffic lights, uses dramatically more.

A reason to have a hybrid - although, as my Prius-driving nephew says, you
don't get your extra outlay back (well maybe these days we will). Charting my
spreadsheet data shows a nice sine-wave between summer/winter consumption. Up
to 60 in the summer, down to 50 in the winter.

--
"A committee is a cul-de-sac down which ideas are lured and then quietly strangled." - Sir Barnett Cocks (1907-1989)

Re: OT: mpg question

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From: a...@harrym1byt.plus.com (Harry Bloomfield Esq)
Newsgroups: uk.d-i-y
Subject: Re: OT: mpg question
Date: Sat, 14 May 2022 18:38:20 +0100
Organization: A noiseless patient Spider
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 by: Harry Bloomfield Esq - Sat, 14 May 2022 17:38 UTC

Clive Arthur has brought this to us :
> Much the same happened to me on a longer trip of 260 miles which I'd done a
> few times. Yes, I'm pretty sure it's the wind that makes the difference.

...and me, I beat 60mpg going east but that declined to 50 going west
against the breeze.

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