In 50 years driving, I wear out the fronts first because of the camber change when turning trashes the edges. Pretty much can get two fronts sets to a set of rears since they are different sizes. On vehicles that freeway drive primarily,, all 4 tend to wear evenly with minor position rotation. My superbug with negative camber on the rear wore out all 4 really flat after up to 70,000 miles of use. If you're trashing tires you have a traction suspension or load problem
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