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Those were some very informative links, and give some definite food for thought. In summary, it would seem the recommendation for a passenger vehicle is 3-5 psi above the vehicle placard, not above the sidewall (except that 35 psi rated tires can go above)
In the case of my minivan that would put ideal psi around 40, which is 10 less than I thought was ideal. 40 psi also seemed the sweet spot on the charts, so assuming tire tech hasn't changed much in 30 years, that would be the ideal psi for my 2 ton minvan.
Thank you for a definitive answer to the question, and i apologize for any inflammatory threads I have posted. My life experience has lent a certain cynicism to too many things I fear.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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