Not really much to storing eth-free. Keep your container full to minimize moisture build up, keep it in a cool and dry place, use an approved container and out of direct sunlight. As mentioned above, fuel stabilizer never hurts. You can use cheap stabilizer with eth-free. If cost or availability of real gas is too much to bare, look for an additive called K-100. No, I don't work for or with them (lol) but I have experimented with a lot of additives and it works really well the regular pump gas. It prevents most of the problems that ethanol causes. Hope this helps.