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As far as pumping losses, there are gasoline engines out there that don't run a throttle, or if they do it's only as a backup for shutdown. They get really good power and economy by doing the supposedly worst thing possible, adding liquid gasoline directly into the combustion chamber and the last possible moment. Still the fuel vaporizes and is burned, just like if you vaporized it 10 days in advance, put it in a special tank and then used it to run your car. Vaporised and atomised are the same thing. Vapor-a substance diffused or suspended in the air, especially one normally liquid or solid.
"dense clouds of smoke and toxic vapor" synonyms: haze, mist, steam, condensation, moisture.
The only reason an ICE works is because of heat. You heat the air, it expands, and moves a piston. To eliminate the heat, eliminates the expansion, and no power is made. Once you use the heat it is now a waste product. You could use it for something else but it is not useful to make power in an ICE again as you need to start cold and go hot or you don't have expansion of the air. If you had some other type of fuel maybe preheating would be useful, say in a steam turbine. But that is the beauty of gasoline. It doesn't need to be preheated to be used.
I still say the best example is propane. There is nothing magical about vapor.
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