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Fender skirts and smooth wheel covers are a given, but I am really curious about the area immediately behind the wheels. As long as the wheels spin and touch the ground they will act as pumps and bring air into the wheel well housing, and the wheel well opening itself will allow air in, it would seem to me that letting that high pressure air escape as fast as possible would be the most aerodynamic thing to do, race car engineering seems to agree. But very often I see quite the opposite, especially on non, high performance aero cars. I am wondering if its for aesthetic appeal to the general public, or if there is proven science behind it.
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