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There are actually many patents on the idea of fuel pre-heaters for fuel injection. The heated fuel expands as it enters the combustion chamber, it burns more efficiently and the injector timing gets adjusted. The first time I came across this idea was a guy who couldn't understand why he got great mileage from the bottom half of his fuel tank. It turned out the fuel pump was overheating. The full tank could absorb the extra heat without any change. As the fuel level dropped it would become increasingly warmer and fuel mileage went up. I'm hoping to try it out soon.
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