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 - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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