I bought a set of gently used Dynapro ATM's in 265-70-16LT's from another member here about 3 months ago and have been tracking the tread depth for giggles.
The tires had approximately 7K miles on them when I bought them and 13.5/32 of tread remaining. Since then, I've put 7300 miles on them myself. As of last night, I have 12/32 of tread left.
Running the calc's, that means the tread is wearing down at a rate of approximately 1/32 every 5k miles. If wear continues at that rate, I should get another 50k out of the tires. (replacing at 2/32 remaining tread) That would yield about 64k miles for these tires. (fingers crossed) Wear across the tread has been very even so far.
I try to drive fairly gently and not mash either pedal to the floor so my results may not be typical.
As of this afternoon, these tires still have 7/32 tread remaining and have approximately 61K miles on them. Since the first post I've put about 41k miles on them and worn the tread down 5/32. That calc's to approximately 8200 miles per 1/32" of wear.