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I say simply, it depends on your starting point. If you're starting with a brick, then maybe you can get beyond a break even point with an active device. If your starting point is a modern car, then it isn't real likely.
This brings up a point which illustrates a lack of ability by some people to contain their leap of logic tendancies. They think that if a brick gets 50% better mpg by putting a kamm on it, they should be able to get 50% better mileage putting a kamm on an already reasonably well designed car.
Ummmm....uh...hmm.
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