RE: Mixing Glow Fuel
Most fuel companies mix by volume, which will actually give you a little more nitro than advertised. A gallon of 20% nitro is closer to 25%. If you want to mix fuel and be more precise/save some pennies, just adjust your volume measurement so your target nitro content is what you intended it to be. I have a post here somewhere where I broke down the 4 chemicals I use and their weight/mL. Doing a few math conversions will tell you how much by weight of each chemical you need and what the final gallon weight is.