I have been storing mine for the winter in my garage since 2011 and I still have the factory tires. I only have 17,000 miles on my 09 Z, so it has spent most of its life parked and the tires have never flat spotted.
I suggest washing it, hooking the battery to a tender and covering it with a quality cover for the winter.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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