your not going to wear the chalk out more or less, your still contacting the road, just not as much..
try putting about 15K miles and hitting it with a depth guage..
over time tires relax at the belts due to over pressure, depending on the durametor of the rubber, the centers will wear more..
I fill my tires with nitrogen now because I got a full tank for free from a friend of mine,
so now my tire pressure stays the same unless I get something stuck in my tire..
4 weeks and my pressures stayed the same and we've some tempuature drops recentally with no adverse effects.
Bias ply is a slightly different thing, I'm talking radials.
My grandfather had a buick Century that I would align every 30K and he always ran 65psi (there was no telling him oterwize)
He was a hypermiler before there was even a name for it..
anyways, his tires wore in the centers because of this, the outter edges remained with minimal wear.. Michelin's are known for that tho..
for the uhaul record, I was there picking up a car dolly and the guy there just filled up the tires till they didn't look like they had any sag in em, I asked, no tire guage.. He goes nope, I do this all the time LOL
Penske FTW!
