I have a 5 gallon and 2.5 gallon can that I store gas in for my lawnmower. I usually take them to the gas station every 3 years or so, my mower ran fine (finally seized up after 21 years).
Fortunately, I just filled them a couple of months ago, so I'll put them in my truck. I wouldn't put 3 year old gas in anything but a lawnmower....
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