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i think one area where a sidemirror causes drag is where it's attached to the body.
on my car the mirror is attached directly to the body, and on the highway in heavy rain i notices a weird swirl (not the mirrors wake wich was also visible)at that location and also a stream of water coming over the edge. not sure what that means, but it all looked like dirty aero...
most new cars have mirrors that are separated from the body, more or less attached with a boom...
i think the way your mirrors are designed is good in this respect, with a "thin" attachement.
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aer·o·dy·nam·ics: the science of passing gass
*i can coast for miles and miles and miles*
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