The most accurate way of mixing the fuel at home, use a inexpensive kitchen digital scale. I have found this is the best way to mix fuel and to compare prices with factory blends. New improved version now includes cost calculation for instant comparison! And it's FREE! Home Brew Buddy was developed by John Fitter from Eagle Air Australia.
Home Brew Buddy allows the modeler to leverage the accuracy advantages and ease of mixing afforded by weighing ingredients into a method of mixing ideally suited to individual or batches of small quantities.