I put a couple of ozs of "Stable" in a full tank, make sure it gets into the FI or carbs, shut the fuel line off and run til it quits and call it good. Never in 25 years have I had a problem. Parked in barn with no heat. It gets regularly to 10F or below here with tons of snow. I do put some moth balls under the seat to keep the mice away.
Jim
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