Further to my poor MPG post,I'm beginning to wonder if I should get the car checked over. When I pulled up at some lights the other night,I noticed a cloud of white/grey smoke wafting up the back window and I noticed the same white/grey smoke when I pulled away.It's not a massive cloud like a blown engine,but still noticeable and a tad embarrassing as I've no doubt the people behind me were wondering why a new car was doing that. Now my A4 would sometimes eminate the same colour smoke on start up (especially when hot) but never on the move (or not that I noticed). Any ideas ??