fuel treatment for ethanol free gas

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about 6 months ago i switched to ethanol free gas and subsequently stopped using my trusty startron ethanol treatment. I have probably topped off (15-20 gal/per) the boat 8-12 times in those six months. I havent been out as much as I want to lately so I am wondering if theres anything i should be doing to treat the gas sitting there. boat was used last probably 30 days ago, so its not worth winterizing, and im heading out this weekend. i know i can walk into west marine and get this answer but i trust you guys much more than them. any help is appreciated. if it matters im running a 2 stroke johnson. thanks