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Thanks for the links and thoughts. I've read probably on this website that outside mirrors may be ~6% of total drag, but if mine are way bigger and draggier than need be, and I can find suitably large enough motorcycle aero mirrors for cheap, why not?
Elsewhere I read that Indy and Formula 1 cars pretty much had been bolting on whatever mirrors were lying around, until recently somebody took another look at this drag source, with good results.
I may find a cheap eBay or similar set of aero mirrors, and make stalks out of aero tubing of teardrop cross-section, or keep the stock round stalks but add teardrop fairings to them. These are only ~1/2" diameter stalks and hold the mirrors in place at 100+ mph, so I am mystified why the car manufacturers use such thick, draggy stalks, not to mention crappy oversized mirror housings.
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