Dave for the Supertigre engines you can use regular 10% Nitro and 18% Oil and mix one part with 2 parts gasoline, this way will end up with 3.33% nitro and 6% oil which is the same oil content on the new Supertiger blend glow fuel made by one of the glow fuel manufacturers (Morgan glow fuels), another thing to consider is that gasoline isn't as dry as alcohol so it adds a little lubricity by itself thus requiring less oil than glow fuel.