Nitrogen serves only to lighten your wallet. It does little for passenger car tires, which are filled with 78% nitrogen right now.
Buy a gauge. A good one. Check tires monthly and remember, PV=nRT, which is true for all gases, including nitrogen, so you'll lose about 1 PSI for every drop of 10 degrees Fahrenheit.
Permeation means that you'll lose about 1 PSI every month through the tire itself. Nitrogen permeates at a very similar rate to oxygen by the way, and you're already at 78% nitrogen.
It's fall. You're going to have to add air fairly often. Don't use crummy gas station compressors with lots of water in them. The principal advantage of nitrogen is its dryness. A good compressor, regularly maintained, produces dry air. That's how you should fill your tires.
Current Fleet:
2016 Tundra Crewmax 4WD 1794
2005 MB S600 (126K, Michelin AS4, HPL 0W40)
2005 MB SL600 (55K Michelin AS4, Mobil 1 0W40)
2004 V70R (143K, six speed M66, HPL 5W40)
2004 XC90 (235K, HPL 0W30 Euro)
2002 V70-XC (295K, HPL 0W30 Euro)
2002 V70-T5 (225K, IPD bars, Bilsteins)
2001 V70-T5 (125K, IPD downpipe, cat back and other mods)
1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)
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