Horribly inefficient but peltiers aren't super pricey.
Multiple kilowatts worth of them are.
The capacitor idea is tried and true, but expensive. Takes lots and lots of particularly expensive capacitors to store the energy stored in a moving car.
Makes me wonder exactly how much energy one can store in a hydraulic accumulator though... despite the lower efficiency of hydraulics... *looks into it*
GasSavers_Vman 
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