I have a 2002 Infiniti Q45 I bought used some number of years ago. It came with clearly two pairs of tires (both were the same brand/type) installed at different times. So, over the years I have always been replacing one of the two pairs as they wear out. Probably about 10,000 miles apart.
Note that tire rotations are done along with other maintenance and repairs, but my mechanic usually keeps the pairs together, though the tires have always been the type that only specify which side goes on the outside, so not rotation specific.
If you are not aware, this car is RWD with 4.5L V8.
It has always felt like the rear tires wear out more rapidly than the front, but I've never actually tracked it, so I'm wondering if my intuition is completely off-base and what are the actual factors in tire wear? Is it braking? Steering? Applying power? Something else?