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      02-21-2012, 07:29 AM   #4
Morning Hawk
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Drives: Subaru R2
Join Date: Jan 2012
Location: Yokohama/Yokosuka, Japan

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According to this article the new F10 M5 is getting on average 24 MPG:
http://www.worldcarfans.com/11106153...ially-unveiled

I figure if a Twin Turbo V8 is getting on average 24 MPG, then a V6/I6 Tri/Twin Turbo (or whatever the engine variant) should be getting better than that [I would hope] or the same.

So, if I were to put down a guess, I would say the new M3/M4 should be getting an average of 25 MPG, conservatively.