Octane Booster for Small Engines

I have access to 87 octane ethanol-free gas occasionally when an out-of-state relative comes to visit and brings me a 5 gallon can. I like to use it for my chain saws, generator, outboard, etc. -- small engines that sit awhile between uses.

Can someone recommend a good octane booster to use to boost octane to 89 to 93 range where some of my my small engines like it?

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Octane Booster for Small Engines