Not Ranked
If you have had your valve seats hardened for the junk they call gas now you might be ok with the lower octane but I would stay with the highest I could get at the pump. The highest we can get up here is 91 and if you test that, most of the time it is closer to 88. You can buy a tester to tell you how much of the so called Ethanol and other junk they use for filler pretty cheap and it is amazing at how it varies from one station to another, even the same brands. I go to the outlet and buy 94 unleaded octane for my lawn and garden equipment as it has no Ethanol in it. Works great in the car when mixed with the pump stuff too.
Ron
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