One more fuel question

[Rludington]

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.

 

[ILENGINE]

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