I am not aware of any marina. Sheps included, that doesn't have some stabilizer or ethanol treatment in the gas they sell. I seen some that actually advertise what additives they use.
ValveTect is commonly the additive I've seen advertised. This is what Shep's sells in case the original poster is interested. See the list of marinas that use it below. From their website:
ValvTect Marine Gasoline is "specially formulated" for marine engines and is designed to prevent the problems of ethanol gasoline, such as phase separation, moisture, poor stability and the formation of power-robbing carbon deposits.
ValvTect Marine Gasoline is "specially formulated" for your marine gasoline engine. It requires no additional fuel additives to protect your engine, eliminating any risk of improper additive use and saves time and money.
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