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I have LT E rated truck tires on my XJ Cherokee. There doesn't seem to be much rolling resistance change above 40PSI. They are also much heavier than a P-rated car tire.
What I noticed playing with pressures: Anything above 40 and wheel bearing life can be measured in months.
60PSI and above: The jeep will actually bounce off of the road when you hit bumps. Good shocks or not.
I do like having E rated truck tires for going off road. Less likely to put something through the side wall. And they seem to wear like iron.
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