I had an old can of coleman fuel and used it in the lawn mower. It is an old lawn boy, 3 horsepower maybe. Two-stroke of course. I got experimental and so I used canola oil instead of motor oil. I threw in a bit of gas-line anti-freeze for good measure. It worked. Nice smell of fried fish. What I noticed was that I had a little more fuel left over than usual and that 3 weeks later the fuel was still there whereas it would normally be evaporated away by now. Perhaps it is just because it is not hot summer yet. Here is the question: If you have an engine which you think is somewhat overpowered for the task at hand, be it a car engine or a lawn mower, would you get better fuel economy by switching to a fuel that has less BTU/gal but the same BTU/$? Also, what if you added some water, desolved in some alcohol, and a little bit of canola oil to help protect the metal parts from corrossion? I have an old '92 Toyota Corrossion I am interested in experimenting with before I switch the insurance over to another vehicle. Suggested mixes for last tank of fuel?