[sporgo]

I want to begin doing some aero mods to my CRX. I really want to try some wheel skirts on the rear however I have read a few places that this can actually hurt mileage on the CRX. The possible explanation was that additional air gets trapped in the wheel wells and adds to drag. I am planning on building a rear belly pan that would streamline the huge parachute area that the rear bumper creates. I am also wondering if I could somehow enclose around the bottom of the wheel wells in addition to the skirts and prevent air from traveling up into that cavity. Anyone know of any potential drawbacks or problems I may encounter from attempting this?