Sold this stuff for a while, Then took some old fuel we pulled out of a tank and double dosed it to see if anything happened. We checked it every month to see if any change nothing in a year and a half, save your money. If you want fuel storage buy av gas 100LL it will last atleast 2 yrs and I have been told by pilots as long as 5 yrs. We just got a station to carry ethanol free 89 oct best stuff for everyday use. Stay away from ethanol it just a get rich scheme by the DC clowns and friends.