Very interested in this thread as have just bought a TDIe. Quite frankly I am horrified at the mpg numbers being quoted and staggered that drivers here are not beating down Audis door about their cars massive mpg underachievement. Too early to tell what my car is doing but if it's more than 10% less than advertised combined figure, Audi will get a right rocket from me. My previous golf TDI 140 GT gave an average of 54.1mpg (tank brim to brim fill every time, not the useless onboard computer figure) over 14,000 miles which was 6% less than the manufacturers combined cycle figure. On the debit side, my new A4 weighs 100Kg more than the Golf (manufacturers own figures) but thats only one person + luggage, and on the credit side it has start-stop, recuperation (!), low rolling resistance tyres, efficiency programme etc etc, none of which were on the Golf. Thus my target figure will be no less than 90% of advertised combined figure of 64mpg = 58mpg real, not that shown on the computer. Everyone else should think the same and not let manufacturers get away with misrepresentation!