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I use the blue/green Stabil
I'm pretty sure the blue/green Sta-Bil is the "ethanol" formula. If you live where oxygenated (ethanol) fuels are mandated or carried, definately use the ethanol formula Sta-Bil. That said, I bought a new Husqvarna mower with a Kohler motor. The Kohler owners manual said that it was approved for 10% ethanol but the fuel separated and the carb corroded. They did warranty it, but the outdoor products center told me they recommend using Premium non-ethanol fuel. They showed me a jar of regular unleaded (with ethanol) that had ethanol formula stabilizer in it. The owner told me that it separated too, but it did take longer to do it. Fortuantly, premium unleaded is available where I live. If you can find it, go with that. Just remember, all states don't always require that pumps with 10% or less ethanol have to be labeled. Missouri is one of those. I confirmed that with the state.