Scuba, where did you find information about Good Year stating the tires can not be in conditions under 40 degrees? I am planing on garaging my 1LE all winter in Michigan but my garage is not heated. I was going to put it on jack stands but now I might consider taking the tire/rims off and storing them in my basement (mancave).
However, I must admit I am a bit sceptical that GM would allow tires on a car that could crack in 40 deg weather when cars are being built and shipped in Canada during the winter.
I work for General Motors and am not an official spokes person for General Motors. My views and opinions are my own and not those of General Motors.