I commute 80 miles a day, have a pretty heavy right foot and a 335i. Currently averaging 26mpg but , more importantly grin from ear to ear everytime i drive it.
I suppose you could get the best of both worlds with a 335d.
~ JB4 ~ BMS DCI ~ Active Autowerks Chargepipe ~ Active Autowerks BOV ~
Borla Catback Exhaust ~ Alpina Gearbox Flash