The biggest concern would be the loss of octane rating and phase seperation. Take out some gas and have a look and smell. If it looks relatively good and still smells like gas its probably fine. Keep in mind it will probably have more of an orange hue from sitting. Make sure there's not a ton of water at the bottom of the tank. When I got my v20 it had been sitting for 3 years but the gas was still ok. The boat I just bought sat for 2 years and the gas is ok as well. In both cases I assumed there was some loss of octane so I slowly drained the tank and ran it in my truck. I used about 10 gallons at a time mixed with 20 gallons of premium and e-zorb just to be safe. The trucks been running perfect on it. If you're planning to use the boat right away and the gas looks ok drain as much as you can and dilute with premium. If its going to sit over the winter I'd drain it all and start fresh in the spring.
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