2 things that stood out to me in the link, 1. raising the rear in our nasty aero cars in their test, actually increased drag, I would have thought getting the undercarriage slightly (1"?) higher would be an even or a plus, and 2, raking the windshield further showed no improvement, however I think that is the case of the sheetmetal in front of it causing such an aero mess, additional rake achieved little..