Difference in mpg for summer/winter

[edition]

Hi, interested in how much of an effect the cold weather has on peoples mpg.

I seem to loose about 3mpg but wondering what others find.

Thanks in advance

[HellDiver]

Yes.

[sinizter]

Close enough to what you said.

[thinfourth2]

I thought you'd get more Mpg due to cold wet air instead of dry hot air.

Unless it is the dark and rain meaning more electricity used for wipers and lights

[60]

thinfourth2 said:

I thought you'd get more Mpg due to cold wet air instead of dry hot air.

Unless it is the dark and rain meaning more electricity used for wipers and lights

Denser air = more fuel to keep the mixture right, you might get an extra BHP or 2 as well.

[FamilyDub]

Last year I noticed a 3-4 mpg difference in winter (less), opposed to summer.

[thinfourth2]

60 said:

thinfourth2 said:

I thought you'd get more Mpg due to cold wet air instead of dry hot air.

Unless it is the dark and rain meaning more electricity used for wipers and lights

Denser air = more fuel to keep the mixture right, you might get an extra BHP or 2 as well.

Sorry my diesel programmed brain forgot that petrols meter air not fuel.

A diesel should be more efficient in colder air where as a petrol will produce more power

[Platinum]

Yes, around that figure. The trip mpg takes big hit in the depths of winter when you have to leave the car running to defrost.

[thebigmacmoomin]

Havent noticed a difference, its 20mpg all year round.

[Lordglenmorangie]

Have not measured it accurately but my 130 Golf tdi has dropped from 54 to 45 !

[FamilyDub]

Lordglenmorangie said:

Have not measured it accurately but my 130 Golf tdi has dropped from 54 to 45 !

Wow. 45. That's really low.

Edited by FamilyDub on Saturday 15th January 12:08

[dave9]

me too - big losses on mpg of say 7mpg on the computer

[aizvara]

My car appears to be getting marginally better average mpg, but that could be mostly down to one much longer journey. Engine definitely feels more... willing. I've also switched to narrower winter tyres & wheels, so that might play a part.

[A.J.M]

FamilyDub said:

Lordglenmorangie said:

Have not measured it accurately but my 130 Golf tdi has dropped from 54 to 45 !

Wow. 45. That's really low.

Edited by FamilyDub on Saturday 15th January 12:08

Quiet you!

My diesel mpg has dropped by about 4-7 but I also have the added bonus of the diesel fbh working when temps drop to 5degs or lower. So more fuel used up. Ah well.

[Ozzie Osmond]

thebigmacmoomin said:

Havent noticed a difference, its 20mpg all year round.

Agreed (but a lot better than 20!).

How people think they will get better mpg when the air-conditioning is NOT running is beyond me.

The only explanantion I can even guess at is people having a different journey pattern in the winter months with less cruising.

[Lordglenmorangie]

A.J.M said:

FamilyDub said:

Lordglenmorangie said:

Have not measured it accurately but my 130 Golf tdi has dropped from 54 to 45 !

Wow. 45. That's really low.

Edited by FamilyDub on Saturday 15th January 12:08

Quiet you!

My diesel mpg has dropped by about 4-7 but I also have the added bonus of the diesel fbh working when temps drop to 5degs or lower. So more fuel used up. Ah well.

Did a trip to Manchester today from Holmfirth so 40/60 country town driving the temp is up to 11c and the milage has gone up to 53. Below 5c and the mpg take a hammering it appears.

[NHK244V]

less in my diesel, cos i use the heater more which lowers the temp of the engine and diesels work more efficiantly with heat ?

[MondeoMan1981]

Big losses in my 206 HDi , from 65mpg down to 50-55mpg.

The car is quite a cool runner to start with and having the heater on so much just takes more away from it.

Driving about in temps down to -16 wont help the mpg at all either, the diesel will be like treacle at that temp !

Noticed the last couple of weeks its picking back up a bit though. 9 degrees yesterday !

[Parrot of Doom]

Cold-weather diesel mixtures at the pump is the reason why mpg suffers. Once things warm up and the mixture is changed, mpg will rise again.