[graydonengineering]

One thought I have had is what if you had a flat plate mirror on a shaft that could pivot to horizontal to the wind so they could slice through it like a knife on the fly when not needed, thuse reducing frontal area down to just a few square inches. You could have 2 switches on your steeing wheel to conect to little motors to flip them when needed. You would probably want to keep them perpendicular to the wind like a standar mirror unless driving on the highway.

A little nuts I know but just thinking outside the box here.