Trying to negotiate a lease for a bmw i4. The work sheet shows a $399 charge for a nitro fill. What is that?
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Is a rare and very dangerous gas that has the ability to permeate the blood-brain barrier and trick you into a bad deal on a lease or purchase.
The most expensive air outside the space station, apparently.
It only makes up 78% of the air out there. Very exclusive. $399 is a bargain.
ChatGPT agrees - Nitrogen is a chemical element with the symbol N and atomic number 7. It is a colorless, odorless, and tasteless gas that makes up about 78% of Earth’s atmosphere, making it the most abundant gas in the air we breathe.
OP - all jokes aside; just say no to it. If you really want nitro in your tires, just get it for free at Costco Tire Centers
What is that? KACHING from your pocket to their for hot air 
What everyone else said, and it’s free at Costco
Naturally it tells you what it is, but not why
It is a junk fee you need to negotiate out of the deal.
Or at least get the discount increased by equal amount if it’s a metric for them.