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of course you can make your car into a steam engine... light a fire under a boiler and use the expanding steam drive your car. Advantages include: great low end torque, able to be done renewably. Disadvantages... you can never never let your boiler run out of water!!!!
1. depends on the price of gasoline, hydrogen, LPG and compressed natural gas. You can find lists of how many kWh are in a gallon of each, maybe not all in one place but should be easy enough.
2. It can be done, butI am with captainslug, probably not the best option. You would need a large tank of super high pressure air if you wanted any range...
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