Alcohol Fuels.
In 1981 the US Army did a study of pure alcohol fuels* and found the following results.
Methanol promoted engine wear in certain sections of the engine. Top of bore and top of ring, cam followers and cam lobes, valve faces and valve guides all wore about seven times faster than ethanol or gasoline fuels. This was due to chemicals created as the by-products of combustion.
The found that pure alcohol fuels ran cleaner engines with less gumming and other deposits.
However Ethanol has its own problems. It absorbs water from the air and this separates if the engine is allowed to sit for extended periods (they didn't say how long). It is also corrosive and will attack the fuel lines of that period.
Game Effects:
Really, this can be used just for colour for mechanic characters or GMs could call for more rolls for methanol-powered vehicles.
(*They also studied alcohol blends and found no appreciable difference to 100% gasoline)
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