i have a TDI 130 A4 Avant 02.
When i bought it 18 months ago, driving it hard got me approx 650 miles per tank, now if i drive it easy i get approx 600 per tank.
It's been in a garage and looked at, couldn't find any problems, i've had the MAF changed, no differnce.
Last week i bought on ebay one of those booster chips that fits onto the fuel temperature sender and fools the ecu into thinking the fuel is cooler than it really is - WOW what a difference, i can now get 53mpg+ at 90mph. Without this device, even on a long run at 70mph i was lucky to break an average of 50mpg .
I didn't think this device would make that much difference.
Could my fuel temp sender be faulty?
Anyone know how to check it???