Stu H - My Octavia tdi 110 (same engine as yours) was remapped and after being remapped the fuel computer used to over read quite a lot. My average fuel consumption used to be 55mpg before and after the remap (checked the old fashioned way by brim to brim/mileage checking) and prior to the map the computer was fairly accurate. After being mapped the computer used to regularly show 64-68mpg! in fact on the way to the ring in it, it was up to 80mpg at one point!!!

Some vag group cars are affected in this way, some aint i found out.

It did manage to do 35mpg on a 45 minute open pit lane session round Spa circuit in belgium as well, which wasnt bad!!!


Just to add, i got rid off the octavia and have now got a 406 hdi 2.0 LX 110bhp. That on this years spa trip did 975 miles on a tank of fuel with 45 miles still showing - and averaged 59.5mpg, and that was 3 up, full of luggage and red bull! (no track use this year though) - not bad for a 8 year old car with 130k on it.