This can is ideal for long term fuel storage. However ,it is sealed so tightly that pressure and/or vacuum will build up in the can to the point that the sides will buckle/'tin can' if stored over a wide range of temperatures. I stored E10 over the winter , and by spring there had been no fuel/water separation and the inside of the can looks good , other than the buckling mentioned above. I would recommend either storing at a fairly constant temperature or adding a vent to reduce the pressure. This would also make pouring easier since there's only one way in/out and dispensing fuel is quite slow.