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1.) How long do you keep that mixed fuel?
2.) Does allowing an engine to run out of fuel cause a lean condition?
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I've used pre-mix fuel that was over 9 months old. I keep it in my shop, in a plastic gas can up off the floor. It stays more temperature consistent that way.
Stihl Inc. recommends dumping the fuel and then starting it back up and letting it idle until it dies. As soon as I say that it doesn't create a lean condition, others will be along shortly to say otherwise. Just you watch and see.