If the engines spec high test....then absolutely. Lot of 2-strokes do, like pro-grade saws.
But my lawn mower, 2 ATV's, logsplitter, etc. It's a waste.
Big MYTH that everyone thinks it's more "pure" or "higher refined" or "more powerful".
Think about it....they used to use lead...don't know what they use now.....but they put stuff in gas that makes it HARDER to ignite. Higher octane is HARDER to ignite than regular. So of course. ..let's use that in small engines which can be difficult to start already.
Oh, and there hasn't been 86 around here for years. 87,89, 91, and sometimes 93.