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As others have mentioned, there are multiple vendor specific PS4S that I can think of that use the softer compound on the outsides of the tire for better performance. These tires are more in between the regular PS4S and the Cup 2 for performance. They would remove any advantage the Conti's have in this test if you happen to have a vehicle that run these.
This test is a better representation for vehicles that don't run any kind of vendor specific tire.
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