A good ballpark place to look is the tire manufacturers' own tread life rating. Different treads will have different tread life ratings as there is a trade off with regard to traction, all season performance, use in rain or snow, and tread life. If there is a tread life guarantee that is also an indicator as one tire may be guarantedd (though prorated) for 40K miles and another of their tires for 60K miles.
Michelin's have an excellent reputation and my neighbor got 60K miles on the ones that came from the factory on his 3/4 ton truck. He is not replacing them with new Michelin's as he spends a lot of time on pea gravel roads and the tires would collect the gravel in the treads and then spit them out when he got onto the pavement.