I have nitrous installed but am not using it, do i still need premium fuel?

[Alternator]

I installed a wet nx nitrous kit 15 months ago (along with a mac cai, window switch, and copper spark plugs). I was instructed to use premium gasoline. But I havent sprayed in a while, and don't plan to in the near future, do I still need to keep putting premium gasoline in my 2004?
Thanks

 

[232Mustang95]

No need for premium when you're not using it