Can you add a octane boost to old fuel to give it some life back? I'm getting ready to drain my fuel tank that has been sitting for 2+ years. The fuel gauge say's 1/4 tank but I dont know if that gauge is right. Anyways I might be looking at about 15 something gallons of gas. I'd like to be able to put the gas back in the boat just to get it gone. I was thinking 5 old gals. to 40 gals of new fuel. Thoughts???