MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Black9 on December 10, 2011, 01:37:59 pm

Title: MPG issue
Post by: Black9 on December 10, 2011, 01:37:59 pm

Hi guys, I have a strong feeling my golf has an mpg issue as over a full tank I'm only getting around 190-200 miles, (fiilled with VPower) it's working out to an average of 17-19mpg which I find ridiculous.... The tests I've carried out over the past few weeks have been on very short journeys to be fair but even on the motorway according to the trip I'm getting around 21-22mpg over a 10 mile journey...

I've heard of a device called vagcom that can identify most faults etc....is there anyone on the forum who lives near Edinburgh that could poss run a check or can anyone recommend a garage that's nearby


Thanks

Title: Re: MPG issue
Post by: seiko on December 12, 2011, 04:59:56 pm

. Could be any one of a number of things, first thing I would change would be the spark plugs, then it gets more expensive, would have a look at the lamba sensors and afm. Data logging with vcds would help.  :smiley:

Title: Re: MPG issue
Post by: Beddie on December 12, 2011, 10:16:36 pm

Yeah a scan with VCDS (VagCom) would be a good start to idenitfy any potential faults but also bear in mind that the GTi is pretty bad on fuel when used on short journeys and that the winter weather and low temps will reduce economy quite a bit too, my ed30 is on average 5 mpg worse through the winter months compared to summer..

Title: Re: MPG issue
Post by: sub39h on December 13, 2011, 12:30:14 am

Even on short journeys 200mi from a 55L tank is not right. I regularly get 360mi from a tank not driving particularly carefully

Title: Re: MPG issue
Post by: lukejenks101 on December 13, 2011, 08:13:53 am

I normally get about 270-300 miles to a full tank of v power, but i only live about 2 miles away from work so that doesnt really help as the car doesnt get up to temperature in that short time, i got just over 400 miles to a tank drving from bristol to truro and back though  :happy2:

Title: Re: MPG issue
Post by: Black9 on December 13, 2011, 11:38:17 am

I'll get the spark plugs replaced early next year as cars not long been serviced, i read somewhere there is later VW ones? Also where could I go go to get it scanned on vagcom? Cheers

Title: Re: MPG issue
Post by: chris s on December 13, 2011, 02:09:47 pm

Am i wrong in thinking that economy should go up when its cold? I drove to bcs today to have my exhaust checked over and the tips changed and i only got 31.3mpg on a 175m cruise down, but got around 37 in the summer

Title: Re: MPG issue
Post by: Tamiyoman on December 13, 2011, 02:13:57 pm

Economy goes DOWN in winter, colder/denser air=more fuel=less MPG.

On a plus note power goes up due to denser air and more fuel  :happy2:

In summer on a long drive I can easily get 39mpg with a steady motorway cruise.

Currently on 327 miles from a tank full and have 1/4 tank left yet, have been driving like my Nan tho!

Title: Re: MPG issue
Post by: sub39h on December 13, 2011, 02:14:12 pm

nope definitely goes down. mine does anyway. dunno how on earth you get 37mpg in the summer tho, i'd never gotten above 35mpg  :confused:

Title: Re: MPG issue
Post by: Wolf Burger on December 13, 2011, 02:45:31 pm

Mines just been serviced and ive been taking it steady with the occasional moment of madness.

33.9 mpg