Pure ntrogen expands and contracts less during heating of the tires, resulting in more consistant pressures. This is why race cars use it. In a passenger car, it's basically a "RacerBOY X!" solution as in "Yo, I'm rollin' on Nitrogen, Dawg!" :D

That window sticker just screams: RUN, don't walk from this dealership . . . and never, ever come back.