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What charges the battery that drives this electric motor? If it is your engine driven alternator then this thing has a net loss of MPG, not a gain! If you instead charge its battery at home (plug-in) then its battery is going to have to be very large to have any merit. It would have to be on the order of 10 times as large as your normal car battery to have much of any worthwhile energy to add to wheel rotation, and where are you going to put it?
This has to be a spoof. ;-)
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