I took one Airtab out to the car and I'd pretty much agree. The rear along the sides is pretty much sloped inward from the rear wheels...probably no separation from windshield to top...
probable moves...in order of difficulty
* air dam extension...lawn edging...easiest...probably a gain
* add a sheet of something at the back to help the air out from under the car
* grill block...carefully done
* mirror reduction...would want to be able to return to OEM...2 small mirrors?
* the kamm-back extension on the rear window...easy to think of...harder to do...once made a set of louvers out of wood and alum for a rear window and used RTV to glue them to the glass....held several years. Problem might be the lip there?
* top 1/2 fender skirts on back...if I find a way to do them right
Will likely do the 1st 3-4...then the going gets tougher....
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