This TDI powered Audi A4 is really good! Dont know yet how accurate is onboard trip computer but this weekend I made some driving. Trip is about 106km one way, resetted computer, engine was warm. When I arrived to destination, computer trip average was 4.0L/100km (58.8mpg)
Made some city driving (many short trips) next day, still was 4.5L/100km, not bad at all!
Driving back 2 days later, resetted computer again, I managed 4.1L/100km (57.37mpg). Route was little bit longer, total trip time was 6 minutes longer.
Driving style: I was driving around 90-100km/h, made some P&G in neutral if it was possible (no cars behind me)