RE: Nitro Gas
It's no more dangerous then mixing the fuel for our race car (another form of racing where in) or putting fuel in your car, or mixing the fuel for your 2 stroke dirt bike, or you weed wacker (aka weed eater) well you get the idea. All you have to do is use your head, dont be stupid and make some simple calculations. Very simple calculations or you could use the link above that harawang gave to do the calculations for you.
Believe me it's not all that difficult to do, just simple calculations along with using your head (gotta factor in the safety aspect) and you should be good. Plus I wanted to add to my post above I used that you could use 5 gallons but you can buy 1 gallon of alcohol or as much as you think you might use for the next month or two or like I said buy 5 gallons make the fuel then sell 3 gallons at a profit.