We had gas that was so old it was yellow. We put tin foil into a metal pan and set it one fire in the driveway. It wasn't much, maybe a cup, so that seemed the best way to get rid of it. Nowhere around here would take it.
Another time, it was old but not so bad, so we put it in the car gas tank. Has enough capacity that it will dilute the bad, and not cause much trouble.
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