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Yeah, BMW is working on this too. I assume they're using Peltier elements (Seebeck effect), as used by NASA on their spacecraft. Currently they're at 200 Watts, but need about 1000 W to be able to ditch the alternator, their guess is time to market 5+X years. It would yield a 5% reduction in fuel consumption.
They're also working on an exhaust-heat-driven expander (steam generator?) mecanically coupled to the crankshaft. It uses 80% of the exhaust heat and reduces fuel consumption by 15%.
Leave no stone unturned!
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You ever notice that birds pulse & glide, too?
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