It is my understanding that nowadays all Nitro comes from China. I have always mixed my own fuels and was getting my nitro from Torco.....but they couldn't help me with one gallon quantities,and neither could VP. They did have a bunch of 66% Nitro model boat fuel with 17% synthetic oil. So what I did was some math and figured that one gallon of this boat fuel has enough Nitro for about 13 gallons of 5% stunt fuel. I then adjusted the oil content to 23% oil mixed 1/2 synthetic 1/2 castor with the correct amount of alky and made myself 13 gallons of stunt fuel.I've been using the fuel and it works great!
The funny part about this is that the 66% boat fuel cost me just a little bit less than if I was able to buy just one gallon of the Nitro from Torco. This procedure is not for everyone,but it worked for me.