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I used high psi in My ranger and it improved the rolling resistance dramatically , I had 31" tires on it , but never noticed what you described , What psi are the tires rated for ? I think its better to sacrifice some tire longevity and have increased mpg then lower psi and lower mpg and somewhat longer tire life.
My Beetle is wearing its tires even @ 50 psi
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Ride a Mtn bike for errands exercise entertainment and outright fun
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