Originally Posted by nospam
Here in California 91 octane is the max at the pump but our gas can be as high as 10% ethanol. I believe the ethanol blends are the reason few will be able to achieve the EPA estimates.
I'm sure it's at least part of the problem.
1: Ethanol in the fuel makes it less efficient
2: Using 89 octane instead of 91 makes it less efficient.
3: Related to 1 and 2, winter blends give less fuel efficiency in the North and high altitude areas.
4: It's the entry level BMW. The "look, I have a BMW" effect surely makes at least some drivers step on it more than they would have done in a Toyota.