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The use of aero surfaces for increasing traction is well known. Formula 1's DRS is a case in point. I do think however that in chasing efficiency, ecomodders would like to see Active Aerodynamics being used to actually reduce fuel consumption by minimizing drag. These would enable air to stick to the length of the car body or even extend the flow. Instead of boat-tailing, aero surfaces could react as active deflectors; to force air departing from the rear of the car in such a way, it would reduce the wake or create vortices. Boat tailing may be the best solution in terms of design, but it would only appeal to a very very niche market.
Active aeros on the other hand is relatively small and can even be a bit of a bling feature for the young. IF the price is right which it is not at the moment. I also fully understand the production cost issue but its the market that they are targeting; it would not get the Critical Mass of reducing fuel consumption.
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