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There may be some aero function, on some of the cars, at least. The wedge in front of the front wheel may serve to kick the air flow out and around the churning wheel? And the trailing crisp edge on the Prius behind the rear wheel forms a Kamm back of sorts. The Prius also has a vestigial rear wheel strake.
I think the hard chine along the fenders and doors is a bit of styling, that has virtually no aero "cost".
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