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Thanks for all the input.
Coupla thoughts:
Closer to the window glass probably = slower slipstream than further out, for lower drag since drag increases exponentially with airspeed
Use Great Stuff polyurethane insulation foam to make streamlined shapes of stock mirrors? That way, a flat mirror and its stalk could be easily sculpted to much more aero shape.
Best idea might be clear model airplane canopy over smaller mirror pretty close to the window glass. Go on Youtube with keywords "plastic vacuum forming" or similar and see how to do this in your kitchen oven + shop vac.
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