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Way back, my old motorcycles' manual stated "Use 94 octane regular".Don't think it's all that anymore. Our cars are designed to run on it. Congress passed laws removing the old knock retardant and replaced it with Ethanol.
I monitor the ethanol content in our vehicles. Quite often, fuel advertised at E10 has no ethanol in it according to my fresh oxygen sensors. Either way, 90 octane is no bueno in our high performance engines, not even my mower, generator and chainsaws get fed that anymore, they all thrive on 93 too.