Quote:
Originally Posted by trey100
Wow - those are horrendous. I know the S58 is not the B58 in the X3 M40, but this has to be 10+ mpg worse. I average 23 on my F80 6MT commuting about 80% highway, 20% suburban side roads. Anyone come from an F80 that knows the difference they're seeing with their X3 M?
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I just switched from an F82 M4 to this X3MC. In the M4, I got up to 30mpg pure highway. In the X3MC, I got up to 21mpg pure highway. My thoughts are weight is less impactful at pure high speeds, I think it's the aerodynamics. I'm picking up loads of bugs on the windshield of the X3MC, and nearly none in the M4. Maybe more drag in the X3 is causing the low mpg. But what do I know.