I just removed the run-flats from my 2007 C6 and replaced them with regular (not run-flat) Cooper Zeons. The ride, handling and noise difference is amazing. I also bought a compact jack, tire repair kit and compact air compressor that runs off the lighter socket. Run flats are not worth the bother or cost. All this with an AAA membership and I am not at all worried.
Put Nitto Invo's on my 2013 Grand Sport after getting 12000 miles out of the Goodyears. The ride, handling and noise difference is quite amazing. Don't need spare since insurance is with Hagerty and they have amazing road service anywhere, anytime.