I never drained fuel on any of my gear up north. I topped off the fuel to prevent condensation from forming. Lawn gear always fired in spring. Winter gear always fired in fall. Even better is if you can get to your stuff and start it once a month and warm it up. Draining the carb dry can form varnish as there's still a layer of fuel left behind. Sitting in extreme temp changes allows condensation to form in the crankcase. Another argument for starting once a month is keeping critters from making homes and gnawing on wires. On an extended deployment (18 months) we all parked our vehicles in the same lot. Every car started when got back except for a couple with dead batteries. This was 200 cars that sat through summer heat and 2 winters. Nobody did any special prep either.
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Good info. About cars, the engine can usually take it while small engines aren't as robust.
Let me tell you of an experiment I recently did. I had an Echo trimmer that I've put hundreds of hours on it and it didn't want to die. I was tired of using it but couldn't get myself to put in the garbage. I tend to use my equipment until it dies of a natural death.
So 4 years ago I mixed a large amount of fuel with 2-cycle engine oil and also added Marine Stabil. My goal was to try to kill this trimmer. I put an end to my experiment this past summer, I was using gasoline that was 3 1/2 years old and the trimmer was still going strong. So I got rid of what was left of the fuel and kept on using the same trimmer.
I am not recommending anyone to do the same. I'm only sharing my attempt at destroying a trimmer and my surprise that 4 year old fuel was still working.