Old gas is a reat cleaner for old grimy parts.. I will also use it to thi out used motor oil, then soak cardboard up with it and brn it in the fire pit, it makes a great starter log.. just roll up an old cardboard box put it in an old small trash can and pour in the oil/gas let it sit a few hours-days, then just take it out put it at the bottom of the wood in the pit and use a propane torch to lite it up.. works great...
Old gas is also good for burning out tree stumps, pour it on ant hills, ground wasp nests or anywhere that you do not want bugs, plants or other things to grow, sorta like a combination of weed killer and bug killer. Just smells bad.. make sure to water it down so it soaks into the ground and doesn't become a fire hazard..