Follow what the manual says. I follow the manual specs during heavy use in the summer. When I store it for the winter I fill with premium, since gasoline degrades over time.
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1974 Seacraft 20' SF with 1985 Evinrude 150 VRO
1987 Seacraft 23' Scepter with 2007 250 HP Evinrude Etec
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