I agree with neil.
However. . .I had considered a possible proposition. instead of mounting it above or outside the the streamline of the car, why not place it somewhere the car has a drag issue that cannot be overcome. The first idea would be maybe a small 6 inch turbine mounted along the grill. Mounted in places the car is going to take a drag hit anyway.
I know you can't get a free lunch. . .but you might be able to recover some of your lost energy from drag(by causing drag where it generates electricity instead of on the surface of your car).
I'm probably totally off and you end up drastically increasing your drag, but it might be worth consideration.
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