Thanks, but you forgot ass behind smart. Like old two smoke said, a lot of differences between av and pump gas. But one problems is when people use AV gas istead of race gas, when they assume it has the same octane or higher based on the octane numbers. Hopefully people that use AVgas know this, I dunno. . Most people run into problems with low octane on av gas since it is tested and rated for a different type of engine than a motor gasoline engine. A standard 110 octane race gas will score a 160 or better on the AV gas octane scale. Big difference so be careful to not subsitute AV gas for these high compression gasoline engines. It's a good substitute "generally" for pump gas. It definitly has better stability and a little higher octane than can be found at the pump.