Despite the wording of the title, the use of 100LL avgas in old tractors has nothing to do with the increased octane rating. However, the chemical additive package for avgas which makes it 100 octane, is part of the reason it is so stable, and has a much greater consistency that pump auto gas.
I've seen phase separation(Ethanol coming out of suspension) in auto gas left > 6 months in a humid enviro. This is a big, big problem as most gasket, seals, and other rubber compounds do not do well in a high Ethanol enviro. The percentage, and type of aeromatics left in auto gas would never be allowed in avgas, as the RVP would cause trouble at altitude.
One could say that avgas is a sweeter refinement. which helps last much longer than summer blend auto fuel.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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