RE: making fuel
It is cheaper per gallon to mix ones own fuel. The difficulty is in finding a source for the ingredients. Having found a source it is not always easy to buy them in small quantities. So the initial dollar outlay can be high and there is a possibility that you will end up with a 5 gallon can or two kicking around. At 10% one gallon of nitro will mix ten gallons of fuel. If mixing all at once you will need say two gallons of oil and seven gallons of alcohol.
The best places to try first are the "Performance" shops, Go Karts/Motor Cycles and/or dragsters.
Figuring out percentages when using fluid ounces can be a chore. So, when mixing go to Wal Mart's kitchen dept and buy a I litre plastic bottle. These are graduated in millilitres. It makes the percentage measuring much easier.
Ed S