The E10 will do more harm than good when being stored. As "jettawreck"My one comment is that I use PON 87 however, I actually want an E10 in the tank when stored since the ethanol will help absorb any moisture so less likely to cause corrosion. What I do is add the stabilizer and fill the tank with PON 91 E10 before storage. The E10 will lose isome octane during storage but the 91 will keep the fuel within spec.
stated the Ethanol will pull water from the air and separate in your tank and puddle on the bottom. Ethanol is NOT a good storage fuel.