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What would you rather use,
87 octain top shelf ethylene free or
91 octain ethylene free ?
I dont know if the top shelf makes any difference in these small engines. No one seems to talk about that.

I won't run anything on less than 91 octane. With or without ethanol, and don't care if top tier or not.

I've been using regular on everything for 50 years.

Most mowers are 8-8.5:1 compression. 87 octane E-0 is fine.

Now if you want to talk chainsaws, 91 E-0 is your friend. Some blowers might be over 10:1 so check your manual for clarification.