This is somewhat along the same subject. I am interested in knowing the "life" of gas these days. I have read in a previous thread that Av gas has a longer octane life than what you get from the normal gas stations, where I get mine (normally 87 octane). I don't use the hi-po fuel but am wondering how long I can get away with pump gas in my boat without having to worry about the octane level getting weak. I use the Sta-bil additive most all the time.