RC Nitro car fuel comes in 5 10 20 25 30% and so on also different oil%. HPI said that you should use 20% nitro but most of us run 30% the engine runs better and cooler.
This is what I run
http://www.amainhobbies.com/product_...l-Four-Gallons One of the best if not the best fuel out there [sm=shades_smile.gif]