Proud owner of this... New PIX added - some advice needed!

[Moschops]

Looking good Duncan, really chuffed Jim sorted your cleaning stuff out...

Stealth has answered most of your questions, I'm getting at least 100 miles to a 1/4 tank, then it suddenly drops off the last 1/4 so average about 340-350 a tank full..

[duncan]

thanks Wayne,

is that mainly motorway driving? ive done 100 miles and used half a tank now... very suprised how thirsty it is in stop start town driving...

[Moschops]

Hi,

No thats, A and B roads, some dual carrage way too and stop start when I get nearer to work at it's on the outskirts of Dudley (nr Brum) does have the occasional spirited run 

[duncan]

do you think there is something wrong with my car since its caining fuel?

or could it just be becuase it is running 240bhp this means it uses alot more fuel?

[WhiteGTI]

What Stealth said is correct really. I tend to get 320ish to a tank, with a mixture of motorway/slow town driving/fast driving.

90 miles to half a tank doesn't sound right, but then again, if your only doing around 22mpg in busy stop start town traffic then maybe it is right...

I'd keep an eye on it. You should be getting around 100miles per quarter for the first half, then it drops off a lot for the second half. I only get about 120miles to the second half of the tank!

[Top Cat]

I think even stop start journey's 22 mpg is to low, I would invest in diagnostic rolling road session and find out for sure. 

[duncan]

I think even stop start journey's 22 mpg is to low, I would invest in diagnostic rolling road session and find out for sure. 

the car is still under warranty so would like to get them to look at it for free...

otherwise how much would the rolling road session cost to do? would be interested anyway to see what power the car is running

[WhiteGTI]

I think even stop start journey's 22 mpg is to low, I would invest in diagnostic rolling road session and find out for sure. 

the car is still under warranty so would like to get them to look at it for free...

otherwise how much would the rolling road session cost to do? would be interested anyway to see what power the car is running

Rolling roads are around £50-£60 normally, or around £30-£40 when its a group day.

This normally includes 3 power runs and a print out of your best run.

[duncan]

that sounds pretty reasonable - can anyone reccomend any ones near surrey / west london?

do they just put the car on the rollers and give you a print out? how would this help find out if i had a problem with burning too much fuel?

[stealthwolf]

Dunno about other rollers but at JKM you get a power/torque curve and a power/afr:p curve. The latter tells you the air:fuel ratio used so you know if you're running too rich or too lean.

[duncan]

That does sound useful - will ring the one closest to me to see if they do the same service.

if it is running rich or lean - what is the fix? is that something i would take the car to VW for?

[john_o]

I would agree with TC , does seem very low duncan. Depends at what point you fill up (empty on guage?)
Remember theres accumulated average MPG so unless you specifically reset the average at fill up , the mpg average will be across all fill ups since you last reset.....

At the very least the average mpg (if reset at the last fillup) , should tally (roughly) with the tank size.
So for me

last tank 370 miles travelled at average 30 mpg. I filled up on empty (but not reserve)

370/30 = 12.33 gallons
12.33 x 4.54 = 56 litres which is roughly the expected tank size 

in town driving , the GTI does not do well tbh for mpg. A good rr session will put your mind at rest 

[duncan]

I would agree with TC , does seem very low duncan. Depends at what point you fill up (empty on guage?)
Remember theres accumulated average MPG so unless you specifically reset the average at fill up , the mpg average will be across all fill ups since you last reset.....

At the very least the average mpg (if reset at the last fillup) , should tally (roughly) with the tank size.
So for me

last tank 370 miles travelled at average 30 mpg. I filled up on empty (but not reserve)

370/30 = 12.33 gallons
12.33 x 4.54 = 56 litres which is roughly the expected tank size 

in town driving , the GTI does not do well tbh for mpg. A good rr session will put your mind at rest 

Thanks John

100 miles for half a tank does seem like a bit of a joke to me but that has been 100% town driving and very short journeys.

my average mpg seems to reset itself every time i start a new journey, tonights journey which was probably only about 7 miles was an average of about 17mpg....

would a rolling road session show up straight away if my car was running lean?

[john_o]

The first avg is auto reset during the current journey time only (ign on/off) (it has a 1 on the display)
second press gets you the accum average (a 2 is displayed)
I'd get the manual out 

heres an example from my blog (note the small 2 indicates its an accumulated average since I last manually reset)


remember simple stuff like tyre pressures, in car items on (heated seats/ICE etc), fuel type used could effect your MPG
I assume you arent running non OE tyre sizes that may through out the speedo?

Good Luck and let us know how you get on 

[duncan]

The first avg is auto reset during the current journey time only (ign on/off) (it has a 1 on the display)
second press gets you the accum average (a 2 is displayed)
I'd get the manual out 

heres an example from my blog (note the small 2 indicates its an accumulated average since I last manually reset)


remember simple stuff like tyre pressures, in car items on (heated seats/ICE etc), fuel type used could effect your MPG
I assume you arent running non OE tyre sizes that may through out the speedo?

Good Luck and let us know how you get on 

have cycled through the display and i seem to only get the mpg 1 up, will double check.  as for tyre pressures and tyres, running standard monza II's with conti 3's alround, pressure is 32psi allround

will check the average MPG 2 and see what it says - how often does that reset?