BPWY is kind of in line with my experience.
It's not an issue with the octane, it's the ethanol. The only gas the stations here sell as ethanol free is 89-91 octane depending on which station you go to. If they had ethanol free 87 octane, I'd buy that, I'm sure it would be less $$.
We are in a harbor town, and have our boats too. Whether it is my B&S, Kawi, or Kohler engines or our Johnson & Yamaha boat engines, there is a noticeable difference in how the engines not only run, but even how they start and idle, and I go through minimum one tank of gas per day, and don't carry more than 5 gallons spare gas with me so it is rolling over very often.
For me, especially regarding the small equipment I run for work- the equipment is my lifeblood, so I'm not even taking a chance on a rebuild or having to buy new equipment if I can spend (here) 20 cents a gallon more for ethanol free gas. It's just not worth the hassle, issues, or potential problems.
That's not for everyone, just in my personal situation with the equipment I run, it works for me, so I just keep using it. As anything- results may vary...