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NASA's satellites are powered by thermo-electric generators (TEDs) which derive electricity from the heat generated by radioactive materials. BMW has no intention of putting plutonium in your car, but is working with NASA to adapt the TEDs to hook up to the car's exhaust system and provide some 200 watts of what would otherwise be (and until now has been) wasted energy. Capturing the heat to power auxiliary systems like climate control, BMW says the system could improve fuel economy by 5%. Not a revolutionary figure, but more than the contribution of both regenerative braking and start-stop combined.

http://www.carmagazine.co.uk/News/Search-R...t-Dynamics-Mk2/