Nitro is an oxidizer, when it burns it creates it's own oxygen.

There by artificially raising the compression.

Higher grades of gas take more energy before they start to burn.

"Perhaps" if you ran a true racing fuel, 101 plus octane, in your mix, you "may" of been able to utilize the Nitro and squeeze out a

few more rpm. I know it made all the difference in my modified 121cc chainsaw.