Ok, there's a few Threads on this but none seem to have a poll so thought I'd make one. Please write your reasons for your vote to get a debate going! I personally am not too sure on this one, petrols are typically more responsive and can be faster however fuel economy is what diesels have on petrols and in performance they are catching up...especially in Audi's but they have that horrible chugging noise. Recently drove a (old) 330d(I think!) whilst dads 650 was being serviced and the 330 was rubbish! Stalled the car in second gear because the power simply wasn't there when pulling out on a road from down hill. However, driving a 170bhp Audi 2.0TDI the car has some lag but after 2 seconds or so it is really something, for its size one of the best cars I've driven. In a 4x4 can't say the diesel bothered me driving a Touraeg and an X5 both, more so the X5, were nice and relaxed and civilised and generally what you'd expect from a 4x4. A same sized (3ltr) Petrol Range Rover didn't seem much better than the X5. Thats my experience anyway, I personally would rate petrols better than diesels despite the loss in mpg the loss in performance. But if I were to have a 4x4 as my everyday car, or have an Audi, I would in those circumstances go for a diesel.