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As far as how gm ran tests at cold temps it seems to me that the cars where stored in a heated area. After going on the track it would not be any problem keeping the tires warm! Going into many turns around the track would generate lots of heat in the tires due to friction of the road surface and also remember they also would be on the brakes many times and with lots of pressure on the rotors,this would also transfer to the tires so once they start turning corners the tires will stay hot.
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