control? And if so did you advance timing to take full advantage of E85 aside from the factory settings? are you a tuner? All i see is that you ran your bmw with 93 octane then E85 and now your set that E85 burns faster. well your right! stock for stock yes! but a well tuned ecu for that specific fuel will run about the same as pump gas at cruisings speed and normal driving! Its when you floor it that all MPG goes to hell on E85 because you need so much of it!