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The Stirling engine is one of the more efficient engines using external combustion. I believe someone (Honda??) built a prototype road car in the 80's possibly, and Phillips used to make gensets using the Stirling in the 50's for British army radios. There is actually a guy in the UK building an EV with an additional Stirling engine in the boot as a range-extender/source of heat for winter driving. Could work if the power requirements of the car is not too high, but they are heavy for the power they put out.
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