I wouldn't want to leave gas in there more than 6 months without using it. Even if you did you would want to put fuel preservative in it, like sta-bil brand or sim.
Just run it until it runs out of gas, whether you dump out the remaining gas first or not. Then there is no gas to gunk up inside. Make sure you have chain lube on hand so you won't be tempted to run it without it. Check tightness of blad and adjust. Every couple years light use I sharpen mine. Picked up a kit at the hardware store, or maybe northern catalog and it takes maybe 1/2 hour. Worth it - saw cuts like butta.
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