50/50 gas and used oil is used by many people in a drip torch. Just like 50/50 diesel/gas is used to the same effect. This study https://www.researchgate.net/public...il_as_an_Alternative_Fuel_in_Driptorches showed 50/50 gas and oil burned 200 degrees hotter and almost as long as 50/50 diesel/gas mix.