FWIW, 90 thousand miles on two sets of LT 215 85R 16's, stock rims, no tubes, daily driver only vehicle. Please re-read the last sentence. I used to check air frequently but gave up after a year or so as they never fluctuated, never lost air. I run 55# in the Michelins, drive far (1K trips), hard (very tight entry/exit ramps onto the freeway where I live). I rotate the tires faithfully about twice a year, perfect wear patterns.

Here's a little more info to blow your minds... Six years and almost 40 K miles on these Michelins with Dyna-Beads = no lead weights. Stock rims, original pin striping.

~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer