I've been doing a lot of googling about octane for boats and I think I found a compromise to my using 87. One poster said his first fill of the year is premium which he says/thinks helps with any octane lowering from the off season. I've been using 87 for 16 years while trailering with no issues and I'll continue to do so. There was a time when only the Y Landing had premium and now Goodhue has it. Every other marina listed on winnigas has 89. So that suggests premium is really not needed. Maybe back in the day of no speed limit the go fast boats could benefit from the extra boost. Not so much today.
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