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A number of cars already have spoilers that deploy and retract (or have multiple positions) based on speed. See most recent Beetles, many Audi TTs, and most Porsches from the last 5-10 years. A few cars have aero devices that change position depending on other things that the driver is doing; for instance the Bugatti Veyron's rear spoiler will go into very high drag mode when the driver steps on the brakes at high speed.
It's only a matter of time before similar things start coming to less-expensive cars.
-soD
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