We have a back-up generator (for hurricane season) that sits unused for years at a time. A couple of ounces of Stabil in the tank keeps the ethanol from gumming up in the carb, and I fire it up every six months or so and let it run until it warms up. I also use Stabil in my pressure washer and mowers, and I've never had an issue yet with the carbs fouling.
I've considered putting it in the Festiva since I only get gas every couple of weeks, but that might be overkill!
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