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Well there is a lot of energy there.
At 60mph I use about 2 gal in one hour. That's 240,000BTU's
My engine only uses about 20% of that, maybe less under that light load, so that's a extra 192,000BTU's. That's about 56Kwatt hours of energy.
But how much of that can really be gathered? That's the hard part, as the engine was designed to get rid of that heat in many ways. But if 5% of that could be gathered and run through a 50% eff turbine, there would be more energy available than my 75Amp alternator could use
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