The work around in Twilight terms is to mix alcohol with diesel to come up with a fuel mixture you can use in jets and turboprops (I think a 50/50 or 60/40 mixture of alcohol/diesel would work). Pure diesel might work at low altitude, but it will play hell with clogging the injectors. Kerosene will power most jet engines in a pinch.
Conventional AvG powered props would be a lot trickier, but I think a 90%-70% mixture of alcohol mixed with something like benzene or maybe kerosene might work. However, I think you could get away with alcohol at low altitude and strict maintenance procedure. Airplane engines are a lot more finicky and unless the octane rating is correct, you will have an engine failure.
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