Join Date: Jul 2000
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Don't sweat it, Johnny. Gasoline is a witches brew of about 60 components including butane and heptane, which evaporate out of it and leave more things to degrade into varnish and crud. Pump gas is built to be used within 90 days and after that it degrades. You can add a shot of Stabilant and keep the gas in a (preferably full) airtight container to preserve it for much longer terms.
But for a 1-gallon container? Not worth while. The stale gas can be dumped at any gas station (in their waste oil tank preferably) or in an "waste oil" container at a marina, etc. Most of them SELL that waste or use it for heating, so only a cranky old SOB would tell you that you couldn't dump it. Especially if you were buying gas to refill it.
If you have a car with a 10+ gallon tank, I'd just dump it into your own gas tank before taking a long trip, so it was burned out with the rest on the highway. When it is diluted down that way and used promptly--no problems, it will burn. It just doesn't burn as well as fresh gasoline. Again, USE IT UP don't just top up a tank and leave it sitting again.
Using it in a 2-cycle engine like a lawn mower can also be a good use for it, they'll run on just about anything. Just don't LEAVE it in the mower, those varnishes, etc, form as it keeps decaying and then it cruds things up. (Crud, tehnical term.)