wyatt, great experiment. Keep us informed of your results please
Thanks to your pictures I just discovered this site :
Aerospaceweb.org | Ask Us - Aerodynamics Questions
(search for "drag coefficient for a cylinder" to find the pictures)
there is also explanations for golf balls' dimples and vortex generators/devices.
bookmarked
The differences between the different shapes are interesting. In your case you should also make your mirrors look like the #2 and not the #3, ie forward the outer parts of yours mirrors toward the back of the car (hope someone understands me
).
Denis.
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