Page "Nitrous oxide engine" Paragraph 17

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.