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If Bob hasn't filled his tank for 2 years, waiting for verification from us, then Bob really needs to sell his boat. He's also likely to be too timid to put his boat in the water because it might get wet, AND there's "things" in the water!
You can use ethanol fuel so long as you don’t keep the same fuel in there for months on end. I used it for years. Obviously non-ethanol is best but gas station fuel won’t hurt it.
What does the manual call for? Yamaha says 87 octane, no more than 10% ethanol, on my 1.8l NAs. That's what I run. Putting premium in would be a complete waste of money unless I'm storing the boat. That's what my manual says.
What does his manual say? It always boggles my mind that people invest so much money in something but can't be bothered to page through a manual for 20 minutes to learn about the product.
Better for running? It won't matter, read your manual and put in what it is tuned for. You have a supercharged engine, and the manual states 91 or greater. So your engine will run 90 without issue, but it is rated for 91.
Better for storing? Always go non ethanol if at all possible, or get 91/ethanol and treat it for storage
Go Gas is the station I use at the North Carolina coast. I use Boostane just as an extra so she runs at top performance. Being an old gear head, it's what I do...