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I don't know if this is possible for gasoline vapor, but I read once somewhere on the all-knowing internet that propane (and natural gas) engines can run much leaner than liquid gasoline engines. This also allows for kind of a diesel-like throttling where you can run super lean, keep the throttle valve wide open and adjust throttle by means of introducing more gas (gas as in propane).
On another note, wouldn't the air also have to be very hot to keep the gasoline completely vaporized and dry? Otherwise wouldn't some of the gasoline just condense back into small droplets in the intake charge?
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