Do some research on Smokie Yunicks Hot vapor engine. I have been wanting to build one for sometime now. I now have the fuel injection technology so it maybe a lot easier to control the fuel. He basicly heated the fuel up with the coolant then with the exhaust the sent it through a turbo charger that he called a mixer then into the engine. I think the key here is to reclaim the heat. I have looked at heat regenerators on turbine engines and they do the same thing to increase eff.
Good luck getting 300+mpg on the cheap gas they sell today.
Hugh
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