Really depends on what engine you have. Some brands call for diffrent % of nitro. Guessing that the LHS knows what engine you have, they have given you the "standard" airplane fuel. I run 15% nitro 20% oil in all my engines, but others use 10%, 5%, or no nitro glow fuel as well. If it runs well on what you have; stick with it, there are enough other variables out there to trip you up!