I called it the SedanKamm. It was great for aero (+6% FE), great for reducing the heat load into the car (from solar gain), and great for getting questions. It was a bit hard to see out of due to the super thin rear window (it still met all codes), and the tendency to reflect on the inside. Overall, I would give it an A+ for a prototype, if it was a final version, it would get a B. You can see that the results of the tuft test confirmed attached flow.