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I have a friend that swears by over inflating his tires.
Now I don't mean over inflating past what the tire manufacture recommends, just what it says on the door.
I decided to split the difference with my Tundra, and I run about 36-38 psi. I'm seeing about 18-20 mpg highway, 16 city. The ride does get rougher with more air in the tires though.
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