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I believe the pressure listed in the book and door pillar is for a maximum weight condition. Most people people not use there vehicle like that. If the tires are inflated to allow for maximum weight, and you only carry yourself 95% of the time, the tires will wear out prematurely, and you will not have maximum traction. Slightly vary your pressure to match your load.
This is much more important on a pickup for instance.....70 or 85 psi is not needed to carry myself. Now if you drop in 3500lbs in the box, you better air them up.....which I do.
If extra tire wear is not an issue with you, then air them to the manufacturers sticker all the time. Just my 2 cents.
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