Firstly sorry to start such a dull topic, after all, if you're spending ?30k plus a few extra pounds a month on fuel probably isn't your biggest concern (esp if like me you still have no idea after paying the deposit 5 months ago, when I'll be paying a few extra pounds for diesel - I digress). I'm currently running a 170 BHP 2.0 TDi A4 which is supposed to get in the region of 48 mpg combined and over 60 mpg extra urban IIRC. However after seeing some comments on here about mpg return I am forced to admit that I struggle to get more than 40, best I've seen was 44mpg with just me in the car on a 200+ motorway journey at a steady 70 (no urban stop start/accelerating). So I wonder why Audi are so far out on their figures when a mate picked up a new 3 series diesel and drove 300 miles home getting pretty much what the book said (and I don't think he drove for economy). The research I did over my economy suggested that the 140 BHP A4 performed as expected and a few 170 BHP drivers got what the book says but MOST did not. Is this just a 170 BHP thing and has it continued with the Q5?