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I run a couple psi below what the book shows for sport package speeds over 100mph. In other works, I'm running 39 up front and 46 in the back. I would think especially in the rears at 36 on sports you would be under inflated and having uneven wear. Aside from mpg you're giving up some performance, maybe some tire life. I didn't notice a difference in ride quality on rfts between 38 and 46.
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