My friend just bought a CLA recently. On the freeway, at 80mph he was getting better gas mileage than my much smaller car gets doing 70mph...and the C pillars don't even taper inward! That is probably more because of the gearing and better engine but normally at 80mph the drag is pretty serious whereas the CLA just shrugs it off.
My guess is that Mercedes Benz is paying a lot of attention to the wheel wells and underbody, because their cars never have any greenhouse plan taper. Porsche cars look like they should have a smaller wake but the Cd ends up higher despite the clever radiator ducting and wind deflectors and everything. They do put rather fat tires on Porsches though. Makes you wonder if it's possible to improve aero significantly with just modified fenders and wheel spat thingies.
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