I looked for a possible additive that you could add to your fuel tank to help the life span of your ethanol gas.
however, I did not get any good results:
looks like there is nothing out there that will allow you to keep the gas in your tank for any extended period of time, without it separating into gas/water.
guess this fuel does not give us problems in our vehicles as we drive them more and are continuing to add fresh fuel.
read this information: