No. I don't think there's any real benefit when you're talking about regular street driving. I know big jets use it because of ambient temperature changes and certain fire related issues. If it's better for cars then I'd like to know how though.
I was wacthing a car talk show and it was saying the benifits are good because you won't have to keep putting air in cause air seeps out and condensation builds in air pumps. and nitrogen keeps correct pressure in the tire at all times.
The benefit to using straight nitrogen is more consistent tire pressures across a wide range of temperatures. Air is 70+ percent nitrogen anyway... the major part of it is that air compressors tend to have a lot of water in them. The higher the water-content of the air, the more the pressure changes with temperature. Therefore the drier the air, the less the pressure changes with temperature. Using a tank of nitrogen to fill the tires is essentially the same as using 100% dry air. Using "normal air" in the tires generally means an unknown water-content of that air. That will mean an unknown pressure gain with temperature gain. Using nitrogen will give you "known 100% dry air" and a consistent pressure gain with temperature. On a road-course, tires filled with air will generally gain 5 to 8 psi from cold to hot. Nitrogen is generally 4-5 consistently... I wouldn't think there would be any reason to use nitrogen in a normal street car... the only real advantage is the pressure consistency over different temps... It certainly can't hurt, and tanks of nitrogen are easier and cheaper to find than tanks of good dry air SS