Given its short shelf life, old gas is not always suitable for your best transportation. However, just because it’s old doesn’t mean it’s not useful.
It might not be the most environmentally friendly way to get rid of bugs and weeds, but it can’t be any worse than the toxic petroleum-based herbicides and pesticides already in use.
Old gasoline might not be suitable for your vehicle, but it’s great for getting a fire going in a pinch. This is quite useful when clearing land to dispose of brush, undergrowth, and tree stumps.
Some preppers collect petroleum-based fuels, filter them, and then mix them with diesel fuel at a 1:10 ratio. This mixed fuel can then be used with diesel engines.
You can use your old gasoline as a fuel source for multi-fuel camping stoves and lanterns. Use it for cooking and lighting campsites or even during power outages.
During an SHTF scenario, you can even make a Benghazi burner for heat like the Allies did in World War II. Fill a large metal container with sand, douse it with your old gas, and strike a match.
Since gas, oil, and grease are all hydrocarbons with varying lengths of chains, old gas used to be a cheap and easy method for cleaning and degreasing all your tools after working in the shop all day.