fyi, for anyone not following the mirrors thread, i just wanted to post some links that basjoos added today. i had a quick look, and these PDFs look like they have some solid, practical aero info we can all benefit from:
Originally Posted by basjoos
According the the following article, the rear view mirrors contribute 3% to 6% of the total vehicle drag.
I seen these! Think they would help my square backed car?? Would the airtab have the same effect
From what I know about aerodynamics (and what I saw on "Mythbusters"), the vortex generators could create a "pillow of air" between your back glass and trunk lip. This way, the air could potentially ride over the vortex creating less drag -- in theory.