First post on tyresmoke, I have experience of this (or very similar) engine in a Fabia vRS and whilst I realise that the A4 Avant is a heavier car I have been a bit disappointed with the economy I have been getting.
It's an Avant, 6 speed with 85,000 miles.
Lately though I have been starting to think that something is not quite right the economy has dropped right off.
Starting problems, when cold (left overnight) takes a couple of seconds longer to start, idles roughly and coughs out some black smoke.
On the move, a bit hesitant and prone to stalling, power delivery is not smooth with flat spots, most noticeable on gentle throttle in lower gears. Even during the day I can see plenty of black smoke out of the exhaust on part/full throttle when the boost comes in.
Economy, the best I have managed out of a tank is about 47mpg (calculated - about 2mpg less than DIS) and that was driving like a complete granny. Then it took a nosedive and no matter what I do it's doing just less than 40. Same usage pattern, tyres are all inflated correctly, no extra weight, climate on ECON, I'm the only driver and usually just me in the car.
Commute: 20 miles to work. 2 free-flowing towns joined by dual carriageway. I never see more than 45 on the DIS. From what I've read, 50 or perhaps more, being careful, shouldn't be unobtainable?
Things I have done...
1st red square: Cambelt change at VAG dealer.
2nd red square: Cruise/DIS fitted by shark90
3rd red square: Replaced black temperature sensor with green one, due to error code when Ben scanned the car as part of the cruise fitting.
Wondered about MAF sensor, read about temporarily disconnecting it, so did that this weekend. Drove a mile up the road. Car very slow, seemingly no turbo boost, no smoke though.