Best way to manage fuel is DON'T buy E-10! Avoid Ethanol. Keeping in mind that isn't always available, Star-tron was developed for Ethanol fuel and Sea-foam was developed in the 50's. I use to use Sea-foam but now recommend star-tron. I work in a small gas engine shop and see the issues fuel causes. I don't believe either will "Cure" ethanol issues but the star-tron is a cleaner, conditioner, stabilizer and water conditioner. It breaks down the water so it eliminates water/fuel separation. Nothing will stop the Ethanol from absorbing water from the air so best case situation is don't buy it.