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This is a great thread about the 1st mod that everyone should do. I have always inflated to 100% of tire rated max. cold pressure. I believe that is the safest because: (1) low tire pressure builds up tire temperature due to hysteresis, when the rubber is hotter it is weaker, thus the Ford explorer situation (2) a leak will give a bit more time to catch it before it get dangerously low. (2) grip is close to optimum at high pressure, even if slightly reduced. stiffness is high which make the car handle stiff not sloppy. Sloppy handling like old US cars is dangerous.
A trick I use to reduce leakage a lot is grease the tire valve. A tiny dab of grease in the valve when adding air get pushed into the valve seat area. I have fixed many leaky valves this way. It works best on bikes since they loose pressure much fast for a given leak volume. Leaky valves are very common. Yokohama sells a tire that looses less air thru the rubber. I have gone many months without having to add 1psi.
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