I agree that mixing old gasoline , and 2 stroke mixtures into large amounts of fresh gas is probably ok . There's a limit to how old the gas can be, however, before I'll mix it in with fresh gas. I have gas that's 10 years old, and I'm reluctant to use it for anything. My state does accept old gas at our recycle stations a couple of times a year, but you have to give them your gas cans too ! And, you can't legally transport the old gas to the recycle station in improper containers, so they get you coming and going. And, of course, all outdoor burning is also now illegal , except for recreational campfires, so if we try to burn off old gas and make a lot of smoke in the process, the fire department tends to show up and start asking questions. I did call a local auto junk yard, and asked them what they do with their old gasoline. They said they would get back to me on that question, but of course they never did. I suspect they just pour it into a big pit in their back lot. I'm surprised that commercial furnaces designed to burn gasoline for winter heat are not common by now. There's a whole lot of fuel free for the taking. In the laboratory where I used to work, we had large tanks where we stored excess gasoline that contained various experimental additives. Once a year, the plant staff would take the gasoline out to the " burning grounds" . We usually had about 10,000 gallons a year of such scrap gas ! The year before I retired, I managed to find a company to buy the scrap gas for one dollar a gallon. I don't know what they did with it .
