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I have stored my 1990 ZR-1 in unheated garage for 10 years now without any problem. I usually put about 5 lbs more air pressure in tires than required to make up for loss over winter and never move car till at least May. I don't put up on jacks, which to me is hard on the suspension. I don't have problems with flat spots in tires come spring. Good luck with your storage.