Originally Posted by Chris55
On my 35d, I'm regularly getting about 37 mpg (7.5 - 7.6L/100km) on autobahn and traffic, and I tend to have a lead foot.
You might want to check the tire pressure as they always seem to not put enough at the dealer.
Also HighlandPete is right concerning the "smaller engine big car" thing. I would imagine that it would be the worst in traffic and at high speeds, when the motor has to deal with the weight and/or wind resistance.
I forgot to mention that I use Shell V-Power only