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Old 08-22-2018, 01:29 PM
Gompers Gompers is offline
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Join Date: Jun 2017
Location: Des Moines, Iowa
Posts: 549
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Your tractor. Do what you want.

But if it runs good, leave it alone. You can run 93 in it all day long. It won’t hurt anything, but you’re just burning money. Higher octane rating just means it won’t detonate until a higher temperature/pressure. That’s all. You can always run high octane fuel in a lower compession application, it’s just a waste of money. Go get some 100LL if you’re so inclined.

That being said, I do run 91 no ethanol in all of my small engines just because some of them sit for a long time between uses and I feel better about having 91 in there to start with vs 87, and I don’t go through enough gas for it to be a major difference in cost.
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