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I don't understand the prejudice against Sta-Bil, I've been using it for decades and it has worked well for me. Having said that, there are/were 2 Sta-Bil blends, one for MTBE and another for Ethanol, using the MTBE blend in Ethanol gas won't protect you from emulsion when the water separates out in the carb bowl so you need to use the Ethanol blend. I put Sta-Bil in my gas everytime I fill a gerry can. My generator has fuel in it that's over 4 years old and everytime I start it it runs just fine. I will also note that most of my engines have fuel shut off valves and before I put them up I close the valve and run the carb out of gas, or I open the bowl drain on the bottom of the carb and empty it.
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