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the last thing is most airplane don't travel close to the ground so the fuel is designed to be ran at higher altitudes, 5000 ft MSL or above is normal

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So what do they do, take them to 5000 feet under a balloon and then drop them?

I was an aircraft owner for twenty years and seldom flew above 2000' MSL.

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I owned one for 15 yrs and seldom flew below 3000 FT, home airport was 3180 ft at the low end of the runway As you know John most pilot take off with the mixture set at full rich and don't think about leaning the mixture until their at or above 3000+ft MSL or at there cruising altitude. My point on the 100 LL is that it is very seldom ran at or above 2800 RPM and at sea level where you can make max power in a N/A airplane, it is avation fuel, not race gas