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Originally Posted by stylinexpat
Not sure why though the Coefficient Drag went up instead of down on this new model. In this case they did not improve. I thought that the Coefficient Drag was rather on the high side when compared to say an current E550 coupe where it is around .27 or so. Would have been nice to see the new M4 under .30 for Coefficient Drag.
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High cD is usually correlated with downforce (actually low lift, since street cars almost never produce actual downforce). I don't know if you've ever driven the E class at high speed but it's much, much less stable than my M3 at 150+ miles an hour. That kind of thing is important to M buyers, I would argue more important than slightly better fuel economy and lower wind noise.