Stolen from another forum. A member has just changed a setting using his VAG COM to correct the 10% difference in True MPG and displayed MPG.

Not sure what cars this will work on though.

VAG COM Change

17 - Instruments - Adaption-10 - Ch No. 3 - Original value 100 (this is a %) my new value is 110. Use TEST and see Average MPG drop in DIS!

Thread here:

A how-to with some VAG-COM modules - VWAUDI Forum

I'd rather it lied to me I think

That channel (ie 03) is not available on the 2007 Fabia vRS. This is a pity since on my car's first brim to brim tankful Trip 2 shows 54.0 mpg compared with my calculated figure of 43.57 mpg based on miles driven and fuel used. :(

But I did take the opportunity to use VAG-COM to increase power steering weight from 2 to 3 - and what a difference that makes.

is this for all maxidots or just octys?

It would be for all Octys that shows mpg on the display.

Yeah, remember seeing this on TDIClub IIRC. Referred to as the 'fudge' factor

Steve

Some instrument clusters support this, and some don't.

54 show vs 43.5 actual is a 24% difference. Normally the maximum allowable tweak is 15%.

DGW: What's done to your car? Remap? Different FPR? Different fuel injectors? Being off 23% is a LOT.

-Uwe-

DGW: What's done to your car? Remap? Different FPR? Different fuel injectors? Being off 23% is a LOT.

-Uwe-

The engine is unmodified, Uwe. After 680 miles Trip 2 reads 56.3 mpg whereas calculated (actual) mpg is 46.44. I will continue logging fuel and mileage to see if mpg changes for the better.

Still 21% off. How about a really kudgy solution: Set your car up to believe it's a US market car. Our gallons are about 20% smaller than yours. ;-)

Seriously though, ~45 imperial mpg seems awfully low for a Fabia with a TDI motor -- unless of course you have a serious case of lead-foot.

-Uwe-

Seriously though, ~45 imperial mpg seems awfully low for a Fabia with a TDI motor -- unless of course you have a serious case of lead-foot.

-Uwe-

It depends on the sort of driving you are doing. It's about what I get doing my 8 mile commute to work. On a long run it's usually a bit better. My trip computer also normally reads about 10mpg too high!

Seriously though, ~45 imperial mpg seems awfully low for a Fabia with a TDI motor -- unless of course you have a serious case of lead-foot.

-Uwe-

If i get 45mpg average i am doing well.

My average atm is 35mpg :( The Car needs mapping for the hybrid.

Just tried to do this on my 2001 octy tdi and can't do it as there is no channel 3 to modify - oh well - was looking forward to correcting my display as it is also 10% out. :(

Octy mk2 seems to be spot on, i do same route everyday and have done real life calculations, maxidot was within 0.1 mpg.