I fully agree with chas0218. Unless you have a very large fuel tank where fuel is stored for long periods of time ,ethanol fuel is just fine. As for the rubber getting eaten up by ethanol.Since the year 2000 all fuel hoses automotive and marine are ethanol/alcohol resistant and do not fall apart because of ethanol. Ethanol will loosen up dirt in your fuel tank. If you have replaced your hoses within the last ten years(as you should) and replace your fuel filter and water separator yearly,you should not have any trouble with ethanol laced fuel.
Oh,by the way.The ethanol is not added to the fuel at the refineries,it is mixed in at the distribution centers so it does not sit in tanks for god knows how long. On the other hand,you should never buy gas from a marina that gets its fuel once a year and has it sit in half full tanks for the entire winter, like in a certain marina on Skeneateles Lake.