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I've seen people replace Michelins due to dry rot, that had 90% of the tread left and were less than 5 years old with no compensation from Michelin.
At lower speeds with aero drag reducing exponentially, rolling resistance becomes a greater portion of total energy losses. I know my Ranger with the Bridgstone Ecopias rolls a very long way and it helps me get good mileage overall.
In a truck that will only go 5k a year, an 80 k tire is a waste of money and the Michelins in the first part of this post were not covered by their warranty.
regards
Mech
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