I like the S65, it sounds great. But in the heavier E90 that I've looked at numerous times, I personally can't get past the 14/20 mileage rating. I know a turbo four or six would be unlikely to get any better mileage at the track, but will likely clobber that rating in daily driving. With fleet mileage standards I think the days of the M5 getting 10/16 and the M3 getting 14/20 are likely to not be seen again.
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