I can give you my experience with ethanol gas and storage. Only one additive has made any difference for me. The carbs would gum up with whatever I put in except StarTron. This additive has been used in Marinas for some time as boats are left for long periods of time without being started, even before ethanol. This was only available at boat supply stores (West marine, etc) until the last year or so. Now even Wal-Mart stocks it either in the auto or boating additive section. My bike is in storage (U-Haul) and has sat for as long as 4 months without being ridden and it starts and runs with no problems. My carbs are stock so far as jetting, etc.
SeaFoam is a cleaner that works well but does not help with storage. Supposedly the StarTron keeps the ethanol from separating and attracting water. Have no idea if this is exactly how it works but it has worked for me. Just my :twocents: :biglaugh: