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Model specific boards => Golf mk5 => Topic started by: telboy on 13 February 2009, 22:27

Title: Winter fuel consumption
Post by: telboy on 13 February 2009, 22:27
It seem slike a trip to JKM in Portsmouth to test my car may be in order??? :undecided:

I drive a 2007 ed30 dsg,..... :wink:

Anyways, forgive me for sounding thick, however am I right in thinking my fuel consumption should be worse in winter than in summer by 2-3mpg???

I only say because since we've had the colder weather, that's how much my car mpg has reduced,....

Anyone else had the same results?

Does this mean somethings wrong or is this the norm??
Title: Re: Winter fuel consumption
Post by: ub7rm on 13 February 2009, 22:32
Funnily enough i was wondering about that today.  I used to get 30mpg on my commute but the best I've seen is 27 recently.  It is a short commute and only long enough for the engine to reach temperature.
Title: Re: Winter fuel consumption
Post by: telboy on 13 February 2009, 22:36
It is really weird as my driving style has changed much at all, the type of journeys I do are the same and the mileage I do is the same,.....hopefully someones got a good reason for it???
Title: Re: Winter fuel consumption
Post by: Rhyso on 13 February 2009, 22:46
think about it for a moment

its colder so your engine needs to work harder to warm up........

works harder = burn more fuel

fairly simple!

its when your MPG drops by 10mpg + then you should start to worry!
Title: Re: Winter fuel consumption
Post by: bacillus on 13 February 2009, 22:46
I too have noticed this on my car with this cold weather.
Title: Re: Winter fuel consumption
Post by: telboy on 13 February 2009, 22:53
think about it for a moment

its colder so your engine needs to work harder to warm up........

works harder = burn more fuel

fairly simple!

its when your MPG drops by 10mpg + then you should start to worry!
Yep,..appreciate that, however after an hours worth of driving it should return to some sort of normal levels???

On a run for about an hour, I used to get 31mpg on mixed driving, now I'm getting 27/8 mpg???
Title: Re: Winter fuel consumption
Post by: Rhyso on 13 February 2009, 22:58
think about it for a moment

its colder so your engine needs to work harder to warm up........

works harder = burn more fuel

fairly simple!

its when your MPG drops by 10mpg + then you should start to worry!
Yep,..appreciate that, however after an hours worth of driving it should return to some sort of normal levels???

On a run for about an hour, I used to get 31mpg on mixed driving, now I'm getting 27/8 mpg???

engine still has to work though

my TDI is exactly the same and i check it over every week with VAGCOM - no fault codes and it goes as well as ever  :smiley:

i wouldn't read too much into it - get it scanned for faults if you're overly worried  :smiley:
Title: Re: Winter fuel consumption
Post by: JonnyG on 13 February 2009, 23:30
Does having the heated seats on, rear window demister and headlights on affect mpg at all ?
Title: Re: Winter fuel consumption
Post by: Saint Steve on 14 February 2009, 07:13
Does having the heated seats on, rear window demister and headlights on affect mpg at all ?
Yes it does.same with having the air con running.
Title: Re: Winter fuel consumption
Post by: Saint Steve on 14 February 2009, 07:14
 :lipsrsealed:
Title: Re: Winter fuel consumption
Post by: No Golf Clubs at all on 14 February 2009, 07:36
On a general commute into work and back my consumption shot up by about 4 MPG by turning off the air con, heated seats, rear window, subwoofer in the boot and using cruise control to ensure a smooth and light tough on the accelerator.  So, yes all these goodies demand lecky which in turn causes the engine to work that bit harder (he said having zero clue about it at all really)..... :lipsrsealed:

Also didnt help me getting revo, having a fight with the dealer and demanding he remove it...since then my mpg has been pants...I reckon he tweaked my settings somehow,....good mind to go to another revo guy and ask them to verify......that said, may just either take to VW for ecu reflash to standard OR go Bluefin and pump up the volume....why am I waffling lol...this thread is nothing to do with all that!  :laugh: Still beats talking to the wife on Valentines day eh! :kiss:
Title: Re: Winter fuel consumption
Post by: vwtroy on 14 February 2009, 09:02
The only good thing about fuel is, that when it's really cold you get more fuel for your tank due to it's denser than on hotter day's so I'm told :undecided:
Title: Re: Winter fuel consumption
Post by: pazz on 14 February 2009, 15:45
The only good thing about fuel is, that when it's really cold you get more fuel for your tank due to it's denser than on hotter day's so I'm told :undecided:

Its a liquid, so wont really make that much difference, if any.

However, the air outside is denser when cold motors in general but particuarly turbocharged ones respond better to denser intake air. You will see higher bhp output from colder/denser air.

MPG will normally go down in cold weather, which I think is down to a fair few things. One of which being the fact that the automatic choke will stay on for longer due to the engine taking longer to get up to temperature.
Title: Re: Winter fuel consumption
Post by: Jimp on 14 February 2009, 17:26
It says in the owner's manual that fuel consumption is increased during cold weather. There's a graph and everything.
Title: Re: Winter fuel consumption
Post by: stealthwolf on 14 February 2009, 20:09
Check your tyre pressures. Checked mine using an analogue guage and they were at 30psi instead of 37psi! All four of them! And they had been checked a few weeks back at Tescos. Went and bought a footpump from Halfrauds now.

I've been getting poor mpg for a couple of weeks now. Normally I'd get 30-35 mpg on the commute to work (nice and steady, 6th gear, little throttle). For the past two weeks, Haven't gotten better than 29mpg.
Title: Re: Winter fuel consumption
Post by: bacillus on 14 February 2009, 20:12
Why a foot pump as the ones that are powered from your cig lighter socket aren't expensive.