Originally Posted by
Dick Strauss
With nitrogen the tires tend to leak (permeate) less air through the tire so your pressure tends to stay more consistent from month to month.
Didn't know that....but (after reading a little bit)... THIS >>> https://www.tirebuyer.com/education/nitrogen-vs-air
Takeaway: negligible difference for the typical car owner.
But if you still want it, don't pay the dealer...cheaper to join Costco...you get the nitrogen AND all the two-fers besides 
"What you see and what you hear depends a great deal on where you are standing.
It also depends on what sort of person you are.”
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