I had a generator sitting in my garage for a year. I meant to exercise it regularly, but we used to lose power pretty often (snow in the winter; wind in the spring and fall) so I wasn't vigilant. This fall when we lost power, I realized it had been at least a year since I touched it. Luckily, I was good about putting Sta-bil in it, and it fired up without any problems.
That said, if I were using fuel, I'd try to drain the tank as much as possible. That makes the age of fuel cut off very sharply after the length of time between fillups.
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