I run 90 octane ethanol free gas in my Rocket, boats, etc. and have been using a product called PRIG (for gasoline, PRID is for diesel) for years.
It keeps everything clean, won't let carbon build up, ethanol settle out, and keeps the fuel "fresh" for well over a year.
A few years ago; the state of Florida began requiring that all gasoline sold for over the road use contain 10% ethanol, and gave the gas stations six months to put up signs advising the public of such.
Most of my neighbors (I live on the water) began having fuel system related problems with their boats.
Luckily, since I'd been using the product prior to that; I had no problems at all.
I've been a believer in PRIG ever since, and, since one ounce treats 16 gallons of gas; it's cheaper to use than Sea Foam.
My Dad uses Sea Foam in his boats, and it works well for him.
Rick