We see machines here with varying degrees of tire wear versus equipment age and their use.
Here are some of the variables:
Mower type - walk-behind, tractor, zero-turn.
Commercial versus residential.
Operation in all weather conditions - wet (tire slippage= increased wear) versus dry conditions.
Slope of terrain.
Terrain Type - sandy versus dirt versus lush sod.
Amount of asphalt or gravel or other abrasive surface the machine turns around on (as with a Z-T or tractor).
Other uses of equipment besides grass cutting - snow plowing, earth moving/dirt/gravel pushing/grading/tilling, power brushing, etc. (usually tractors, sometimes Z-Ts).
This is difficult to analyize without like metrics.