Propane injection in diesels reduces diesel fuel consumption, but then again you're using an other fuel, propane, so there's no magic there. There might be a tiny advantage, since the fuel burns faster, the combustion is completed closer to TDC, but it's not worth the hassle to set a controlled system up. Propane injection is mostly used to make additional power, and when you're running with the pedal to the metal, such an injection system does not need many controls, but a single solenoid valve.
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