Yes, I totally agree Alex! In city driving I usually change gears quickly and go into 4th gear to move with 50-60 km/h, that's why I get such a good fuel consumption, while on the motorway I move with 3.500rpm to reach 120-130, so the car should be drinking a lot of gas. Good thing is that the car pulls really well from low end, so you can change 3 gears with less than 2500rpm.
If that consumption continues, I'm gonna love my f4!!
P.S I use 5-30 oil.