kach22i -
We have speculated that adding a clear "boat tail" would be the best way to make a mirror more aero. The problem is that the clear material often distorts the reflection off the mirror, and/or adding more reflactions, rendering the mirror useless.
I did a version of this by making an "Easter Egg" rear view mirror :
I only tried it on the passenger side. In addition to the distortion it was pretty small. It may have worked better on the driver's side.
Imagine the bubble canopy of a P-51 Mustang. You could probably get one meant for an R/C plane. I think *that* would be the ideal shape.
CarloSW2