The tires should be wear checked every so often and rotated when uneven wear is detected. Per Michelin on my Primacy OEM. Preferably below 1 mm difference. Discount will rotate free on tires purchased there every 4k miles. Did you wait 10-12k miles for oil changes to rotate your tires? In an emergency stop wet or dry your rear tires must grip better than front to prevent the rear from passing the front. It's a liability risk and dealers insurance probably has exclusion of coverage in fine print by mm. Drive it like it is until you change all four or move rear to front and put new on rear. Personally I would go to UTIRES.com, purchase two identical tires with tread depth to match rear within 1 mm.
Edit to add: front tire wear is increased exponentially as they become more worn from front. On my primacy best wear is at 3k rotations. Pretty much even wear but just did last rotation at 4.5k as fronts were little deeper than tears at checks.
Edit to add: front tire wear is increased exponentially as they become more worn from front. On my primacy best wear is at 3k rotations. Pretty much even wear but just did last rotation at 4.5k as fronts were little deeper than tears at checks.
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