I read somewhere that the F10 was supposed to be more fuel efficient than the E60, can't recall where. 1,400km in on the 535, I'm clocking 7.2km/l, which is hardly any savings from my old 530 that's been chipped up, cat converter off and sprint-booster on! It would be worse after the same mods, no? 
Any 535 owners getting better mileage?
Any 535 owners getting better mileage?