I drive the speed limit, perhaps slightly above. So on the Interstate that means 68-70 mph when it's posted 65. While I appreciate some drive closer to the minimum MPH, I find this practice particularly dangerous as there would be situations where you're close to 20 mph below the speed of those around you. The point of my work is to find gains in MPG while maintaining a functional car (so you won't find me ripping the seats or AC out).
>Rear diffuser panel in area where option exhaust would have gone (rounded leading edge and blends to bottom of bumper, made from carbon fiber)
>Flat parachute-bumper close-out panel on exhaust side
>Infill panels just behind front tire that fills in gap to factory underfloor panel. Removable.
>Smooth convex wheel covers.
More underfloor work. Side skirts, trunk trailing edge extension, blade antenna.