I am on my second tank. Since the day it was installed I have been adding Starbrite Star Tron Enzyme Fuel Treatment to my gasoline. Starbrite Star Tron Enzyme Fuel Treatment is recommended by some folks in the boating industry to keep ethanol from ruining fiberglass/plastic fuel tanks. Starbrite Enzyme Fuel Treatment is supposed to keep the ethanol in solution with gasoline. So far it is working.
The dealership that services my Ducati has started carrying Starbrite Star Tron Enzyme Fuel Treatment. Someone other than me told them to stock it. (The Ducati rep? I don't know.)
Stabil also makes a marine fuel treatment. It is different from the regular Stabil that we sometimes use when we store our cars/motorcycles for the winter. I have been told that you need that you need one of the marine treatments to deal with ethanol.
Ducati Paul Smart LE