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To: Carolyn who wrote (8920)	8/3/2003 6:18:27 PM
From: Ish	Respond to of 34894

I did hear that on the radio. We don't get USA Today out here. I've done some engine work and can maybe help. It has to do with compression and timing of the spark. The higher the compression the more likely it is to detonate in a hot cylinder. That causes knock, or what could be heard as engine clatter. Also causes run on after an engine is shut off. Higher octane made the fuel/air mixture harder to detonate. Solved those problems. Advancing the spark gave better gas mileage but could lead to pre detonation, engine knock and run on. Todays engines have fuel injection and are controlled by computers, that's why you don't pump the gas pedal 6 times before trying to start your car in winter now. They adjust to the octane, air temperature and rarity if you're in the mountains. For older cars that used a carb to feed the gas in 10% was the limit on alcohol on the mix. I ran a tank of 85% alcohol the other day. Worked fine.