If you've ever seen someone burn rubber at a stoplight, you know what causes tire wear. Friction. What you may not realize is that the wear caused by friction is the result of several factors, including the tire's rubber, the tire's load and inflation and the influence of the vehicle's mechanical systems (such as alignment with road surfaces).
To achieve max tire wear, tires should be properly aligned, properly inflated and carry the proper load weight. All of which should create a well-worn footprint with weight evenly distributed over the footprint to maximize the tire's tread life. Unfortunately, in the real world, plenty of good tires suffer from poor maintenance.