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I can't help specifically with the GYs but I was at the Corvette Owners Class at Spring Mountain earlier this week and they were told by the Michelin Engineers that the cracking of the MPSSs generally didn't occur until freezing or below and GM just added 20 deg F for safety when they did the owners manual.
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Perry
16 SharkGrey A8 Corvette Z06
18 Cadillac A8 ATS-V
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