I think your right Beau, i found this wiki on Nitrous where it is mixed with Propane or CNG
It is possible to combine the use of nitrous with a gaseous fuel such as propane or compressed natural gas. This has the advantage of being a dry system and yet still maintaining proper air/fuel mixture. Such a system requires exact choice of jet sizes and gas pressure regulation to provide a consistent pressure to the jets. Other advantages include better air/fuel mixing and distribution and less risk of knocking due to the increased octane of propane and CNG.
Nitrous oxide engine - Wikipedia, the free encyclopedia