[jime57]

Fascinating thread. I been looking at the rear of my own Insight and rolling some of this over in a very rough fashion. From a practical viewpoint, it looks like one would want to remove the rear bumper facade, the tail lights, and the hatch minispoiler to get a "clean" starting point and attachment point. That would also shorten the tail extension slightly. It also looks like the sides of any extension get rather complex since the rear wheel area is wider than the upper sides. The complex side must add some aerodynamic complexity to the basic equations, but I can envision how the air might flow, if this shape was extended into the tail. Anyway, enjoying the discussion among the heavyweights!