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Current engines do run off of gasoline vapor. Liquid gasoline doesn't burn. As the fuel is injected, typically it is aimed at the intake valve which is hot. The heat from the valve is transferred to the fuel which is then vaporized. The larger droplets soon vaporize in the combustion chamber from the residual heat alone. There are gains to be had from decreasing the fuel droplet size, but it is not anywhere close to 2x, its much closer to a couple percent.
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