My 2007 Solstice GXP didn't have a spare either. 54K miles, not even a leak in a tire.
Consider this: I still own a car I put 250,000 miles on. I never had a flat tire in that
quarter of a million miles and 25 years of driving it. That was also a summer only car. In all the cars I drove during the other half of those years, I had
one single flat tire. I've been driving since 1987. Tires are pretty okey-dokey in the 21st century
