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High Millage fuel system 200+mpg possibility (of course there are other ways to get the same or better.
Exhaust heat: This has been thought of before, using waste heat to heat up fuel and have it create more vapor. Using low temperature such 300 degrees will only leave waste/dead fuel (longer carbon bonds) in the base of the tank. So we use exhaust heat to fix that issue since exhaust heat goes much higher.
Challenge 1 You can't simply heat the fuel and boil it to get all vapor because of the mixture of fuels from the refinery.
Challenge 2 if you were to have the entire fuel mixture heated enough so the heavy carbon chains would boil, the lighter carbon chains would turn to vapor and cause "vapor Lock"
Challenge 2 solved Use a tank boiler design (high psi)
Challenge 3 maintain the correct air: fuel ratio, (no its not 14:1, never is or was)
You would need to build a primary heat exchange at a pressure high enough that none of the fuel would boil when the temperature of the mixture was higher than the boiling temperature of the heavy carbons at a lower pressure. Holding a liquid under pressure prevents it from boiling. the pressure in the fuel system is one of the factors that prevent vapor lock in summer. You will want to put enough heat energy into the fuel so that it will all boil when the fuel is released into a lower pressure area. The primary fuel ex changer should be at least 400 degrees and 450 pounds per square inch. Make sure your not creating a vacuum otherwise you will get vapor lock. Redirect the exhaust system though the heat exchange using a thermostatically controlled device. Use SS Steal for this. (this is needed to regulate the temperature. The extremely hot fuel mixture from the primary heat exchange should then be released into a 2ndary heat ex changer (400 degrees) though a pressure regulator. The regulator should take high pressure 8k psi and regulate down to 1-50 psi. keep the 2nd heat exchanger at about 4 psig. the fuel vapor that is created can be fed in to the air intake. 3rd part of this is another regulating or storage exchanger. This is to provide storage for a bit of pressurized vapor fuel so that extra fuel can be created on demand for acceleration. Can act as a surge suppressor to ensure a constant vapor pressure to regulate the air fuel ratio. (there's more but for now here is the "just" of the concept)
with all this you will need to keep the oem fuel system intact, start the car and get it warmed up .. turn the system on and then have a kill switch for the oem fuel system.
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