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Sorry, but I don't "buy" it. No free energy - - - whatever those things generate has to come from the car's motion, which was hard-won by burning gas. Factor in conversion inefficiencies, and it would have to be a net loss. I can't imagine anything else.
Unless it was like a regenerative braking thing and only "charged" when braking, but I didn't see any mention of that in the ad. (I didn't look at it REALLY close, though).
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