Yeah, most general aviation planes do. Has a lot to do with infrastructure and certification requirements. You have to modify, then re-certify the engine. Most

Yeah, most general aviation planes do. Has a lot to do with infrastructure and certification requirements. You have to modify, then re-certify the engine. Most manufacturers don't want to do that unless there's a clear benefit. Most people would prefer to use standard automotive gasoline. You can see people in the experimental/sports aircraft category rejoicing when they can find a "MoGas" pump.