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The volvo S40, DRIVe edition, has a flat spoiler at the rear end of the trunk. From volvo's web site it participate to 15% of aero drag reduction (other is from grill partially closed, car lowered and better tires). I remember the HCH-II has such a spoiler.
In Huchoo's book, the trunk aero can be improved by lowering the angle, ie make the trunk longer and/or higher. He shows Audi improved the Cd by 0.025 between version II and III of the Audi 100 by making the trunk longer by 75 mm (3 in) and higher by 50 mm (2 in).
As I will never have enough time in following months to make my uglyback harder (and uglyback's coast down testing was a failure 'cause of traffic), I'm thinking about doing a flat spoiler in a quick and ugly way to the very rounded megane trunk.
Denis.
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