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I have a friend that has a nice collection of them, and he runs aviation fuel in all of them. 100 octane LL has plenty of lead in it and, more importantly has excellent storage properties.
They don’t typically get ran much, so the expense isn’t a factor
 

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I run cheap car gas in mine (when it ran.... :lol: )

These things were designed to run on really crappy fuel all day long in the field. I’ve never heard of a valve seat issue either running today’s gas.

100LL or Avgas is some really good stuff, but very expensive and hard to cart around in quantities that make sense for a tractor. I used it in dirt bikes when I used to ride 2 strokes, but those days have past.

My 60 will be built to handle today’s pump gas and take advantage of the higher octane that’s normal today. I should easily be able to almost double the power output with little mods burning 87 or 89 octane fuel. :good2:
 

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The reason my friend uses AV gas is because it has a storage life of >5 years probably closer to 10. It is a straight run hydro carbon—no blending. He has 20 or 30 antique tractors and like to take them out once in awhile to parades, and antique tractor pulls. He was constantly screwing with carb cleaning and changing out fuel. Stabile didn’t help much. He started using AV gas on my father’s advice many years ago.
If you ran it for a few hours a year, it would be worth it to me for that reason alone.
 

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We run 91 non-ethanol with lead additive in our '56 Case, I guess we've never tried running anything else.
 

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Stabilized cheap pump fuel. It's amazing how it will run on anything I put in. I even dump my old mixed fuel in it when I want fresh stuff for the little sensitive 2 stokes. The thing never misses a beat.
 
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