It's not quite like Nitrous use in a gasser, though... Nitrous is an oxidizer... you can also use it in Diesel engines. Propane is a fuel, and can also be used in gasoline engines.
I wasn't aware that propane won't auto-ignite under compression? Or did you mean under the compression that normally occurs in a combustion engine?
OK - LPG will auto-ignite at ~1000degF, so probably not going to happen in a normal combustion engine.
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