What is the best gas stabilizer? I just ran out of my regular red Sta-bil and thinking what to buy next. I notice that Star Tron promotes it will treat more gasoline per bottle than Sta-bil and also hold it longer. Sta-bil also has its 360 as well, as well as marine 360. Star tron has product with a higher concentrate. Now, I know there are others what there. Ethanol Shield, you name it. Which one best for small gas engines.