I'm not 100% sure if this was already mentioned here, but looking from the front of the vehicle at your mirror "adjustment" (cover), I'm thinking that the "knife edge" portion of it (the flat frontal area) should actually be cut diagonally from the inner-most point to the outer-most point on the mirror, then tapered back to a point...
This has two effects:
It cuts frontal area considerably.
The shape is considerably less deflective than a flat edge facing into the wind.
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