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I've been aware of some people adding up to 50% vegetable oil to gasoline in countries such as Thailand and Brazil, yet I'd take it with a grain of salt due to the oil not vaporizing properly. Maybe adding a tablespoon of turpentine to each tank could help...
But if I were willing to try, I'd take a look at the preparation done to gassers in Finland and other Scandinavian countries to use kerosene in the '70s and '80s, such as a lower compression ratio.
When it comes to direct injection, it may work better due to the increased heat at the compression stroke, and also taking the Hesselman engines as reference, because they retained spark-ignition yet could handle heavy fuels because of the direct injection.
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