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      07-25-2012, 10:29 AM   #118
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SamS's Avatar

Drives: 2018 X3 M40i
Join Date: Jul 2010
Location: Dallas, TX

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Originally Posted by mapezzul View Post
I agree and like you fully expect more efficiency than that- especially with all the new tech. They can't do any worse, that is for sure! I would also imagine that they use taller gearing instead of 6 close in the manual which by itself will help a ton as will losing the always on rear diff. If I were a betting man I'd go mid 20s on the highway...
Is the rear diff in the F10 M5 not always "on"? I know it has an electronic motor back there. I expect the F8x to get some version of the M5 diff.

Originally Posted by mapezzul View Post
My E90M is a hog as well but occasionally with a tail wind I see 20 on long highway stints! Sometimes I think that if it didn't sound so damn good I wouldn't drive it so hard
Yeah, I got 21mpg on my drive back from PDC to Dallas, but I was really trying to go easy on the gas.

Around town, the car feels boring below 5000rpm, so I'm always looking for a reason to goose it higher. That's probably why I never get above 15mpg. With more torque in the F8x, revving up to 6K shouldn't be as necessary.