The front Michelin Latitude Tour tires on my 2008 V-8 also fell apart 1/4 of the tread width near the sidewall. It looked like something was gouging out flaps of rubber. They were kept at 38 psi (36-39 range), and would get to 40 psi at highway speeds in hot weather. I replaced with Michelin Latitude Sport tires which seem to roll smoother. These summer tires have less tread depth near the edges (and thus look smaller in diameter) but don't have the thin slits like the tread of the Latitude Tours.
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