Nitro and gas does not mix, so you cannot just pour nitro into the fuel tank. The gas will float on top of the nitro. The greater the percentage of nitro, the leaner the mixture becomes, thus needing to ramp up the volume. The ratio's really get wild once you get abouve the 94% nitro ratio. Back about 8 years ago when I still ran a Carb on an old fuel bike, we would sometimes run 100% nitro. The jetting would have to be changed in the Carb for every 1% nitro change between 92% and 100%.
Back on topic - Do not run nitro of any sort in your streeet motor. The acid build up in the motor oil will kill your motor in short time.