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Oh, and the issue of fuel economy between LT tires vs P type tires:
Because LT tires carry so much more load than a same sized P type tires, the tread compound has to have increased compression set resistance.
Ya' see, rubber is a visco-elastic material - which means that under stress it can flow - and since LT tires are subjected to higher stresses …….. That means that the rubber compounds used in LT tires have worse hysteresis - worse RR - and while the hysteretic properties can be improved by sacrificing wear and/or traction, they can't be better for LT tires without sacrificing compression set properties.
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