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I believe that 70k on either tires or brakes is a minimum for economy, not just FE.
It's fairly common for DODGE Cummins-powered pickups to see well in excess of 100k with LRR Michelin LTX A/S. I replaced the factory set of mine at 120k with 4/32's remaining. Second set is wearing at a rate that suggests 250k truck miles on but two sets of tires.
Rotations when I remember, or, about 20k apiece. Factory-recommended pressure settings (or according to weight scales). Load and pressure need to match for best life and best (safe) performance.
Michelin recommends no more than seven [7] years on a tire (ten [10] if it is a spare never-used) as ozone, UV and other problems degrade the item. At the very least it is recommended that a Michelin dealer de-mount and inspect the tire past the seven year mark.
Be careful of age and heat. Tire delamination is NOT pretty.
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