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On the mirrors, yes, I know they fold back. I'm not sure it would help reduce drag. Yes, it reduces front area, but it might cause even more flow separation along the sides of the body. You'll see mirrors on newer (especially high-priced) cars that have a larger gap between the car body and the mirror housing, as well as a smaller mounting arm, I think because it disrupts flow along the length of the car less. Ideally, mirror housings would be as small and slippery as possible and mounted at least several inches from the car.
Now that I think of it, perhaps I should try some sort of extender, barring replacing the mirror with something a lot smaller.
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