Up here in New England we need to store our boats most of the winter, usually from November to May. I know in just those 7 months mid grade gas will degrade almost to the point of it being useless. The engine will ping with it and if the tanks were not full their will be water in the fuel.

I would load it with dry gas and any octane booster you can find. It may have been 93 when you bought it isn't anymore.

In the future use Store N Start or another type of fuel stabilizer.

I have seen 10+ year old gas turn to a varnish like substance!

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200