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If I had a road force including a lateral force balancer it might see changes. Yes, Tom, Florida has smooth roads. I think the most important thing with extended life oil changes is people drive their cars with the tires low or at the minimum pressure. That scallops the tires. We see 1/3 of the cars coming in our shop with chopped tires with full tread. I tell my guys to fill to the maximum psi on the side of the tires. That way the next time they come in we have the option of lowering the psi if the center wears more than the other side. And we hardly ever rotate tires unless the customer asks. I tell my guys to look and feel the tires note the wear on the report.
