Your old tractors were designed to run low compression old dirt gasoline back in the day, they were fine with low octane and not the best fuel. There would be no point in running a high octane fuel. They probable started life on a gas lower than 86 octane and were built with that in mind.
Most recent engines are designed to run about 85-88 octane fuel.
Some fancy cars want a higher octane, they run higher compressions. Look in your book.
Running a higher octane then needed doesn�t help anything, probably doesn�t hurt anything but your pocket book, maybe wouldn�t want to get too high an octane for what the machine is, it will compress and detonate differently than what the old engine was expecting.
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