I posted
'I get about 450-500 out of the 2.5TDi Qs which works out at around 38-43 MPG on a usual weekly usage, the 1.9 2WD is better, 650-700 which comes out at 50-54 MPG.
Best I got from my 2.5 was Morrisons Dundee to Morrisons Canterbury on a tank 536 miles at 47 MPG.' on a thread asking about milage returned a while back.
I think the A4 2.5Q does very well performance and MPG-wise. It can shift, but you get a reasonable return on the daily comute