I NEVER run ethanol in my boat, 91 is stable way longer than alcohol gas. Had an argument with my brother who said premium is a hoax. He had to drain his 20 gal tank this spring because the gas smelled like paint thinner and the motor wouldn’t start. I have a 40 gal tank and I run it on the low side in late fall.. add Seafoam the last time using it and then fill with fresh 91 in the spring. Never an issue. I’m a mechanic for a living. I work on stuff that is stored with ethanol gas in it. It looks like a D cell battery that leaked in your flashlight. 87 or 89 is ok for vehicles that don’t sit for 6 -8 months without being used but not boats… especially carb models.
spot on, I do the same, there’s a reason they make ethanol resistant gas lines for small engines.it will wreck lines,and rubber in short amount of time.