[dumb_ricer]

I think the sams club uses nitrogen to fill all there tires. Thats what I heard from heresay at least.

And nitrogen really isn't needed in a street car. Like others have said, it is mainly for road racing, as tire pressures before running and after lapping can differ like 15psi aka a shitton.

Nitrogen is still going to leak out of almost any hole/bead leak in a tire, it will just take slightly longer. If you have a leak, just have it repaired or repair it yourself. If you use bead sealer on both beads and bead seal the valvestem, the odds are tire pressure will stay about the same.

Oh, and make sure to fill up with winter air, it lasts longer than summer air.