Quote:
Originally Posted by Red Bread
91 US is what it's designed for. When we moved from CA to TX, the jump from 91 to 93 actually lowered both of our cars (an M Coupe and a 135i) average mpg slightly. Of course the N54 1er was busy destroying HPFP's so I never really paid it much thought.
|
Probably because you could run more boost in them
