Quote:
Originally Posted by dab1123
To the best of my knowledge, psi varies according to the brand of tire. I always inflate to within 2psi listed on the tires sidewalls. i.e. my Goodyears list Max. psi 44. So I go with 44 in winter & 42 Summer. (Outside temp. causes tire pressure to fluctuate slightly.
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The tire pressure on the sidewall is maximum, and as I understand it...it only applies if you are running the maximum allowable load on the tire. Typically, it is not applicable and will just result in an over inflated tire (good gas mileage but poor wear and possibly poor grip).
The vehicle specified tire pressures are based on tire size (OEM tires) and vehicle weight/distribution...also as stated above it sounds like there is some safety factors thrown in for good measure. So I would vary tire pressure based from the recommend vehicle pressure not the maximum tire pressure.
To give a few more points of reference here are the recommended tire pressures for my vehicles...
Full Size Van - 35/44 psi [Front/Rear]
Old Toyota- 27/27 psi [Front/Rear]
New Civic - 32/32 psi [Front/Rear]