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Keep in mind that most punctures are in the thread portion of the tire and involve a nail or screw. In some cases, the nail or screw seals the hole very well and a leak is not detected. In the majority of cases, if there is a leak, it is a very slow one, allowing you plenty of time to either refill the tire or drive to a tire shop. In the 35 years I have been driving, I've had three leaks and one blowout. The blowout occured because I ran the tires down to no threads, so I was asking for it, but in the other three incidences, the leak was slow enough so that I never had to change or repair the tire, myself.
But before I tell you what I keep in my coupe's compartment, let me assure you that the difference between driving a C5 with OEM runflats and driving one with non-runflats is like comparing the ride of a wooden wheel wagon to that of a boat ride - it is THAT much different. I never cease to be amazed at how much more comfortable my ride is, now that I have my Goodyear GSD3s.
Regarding tools, I carry a patch kit, small 12V compressor, aluminum Mercedes jack, and some pliers, but honestly, I don't expect to use them anytime soon.
Any non-runflat will save you and your driving style will dictate whether buying a top-tier set of tires is worth the extra money. Top-tier includes Michelin PS2, Goodyear GSD3 and BF Goodrich KD2s. Of these, the GSD3s last the longest, the PS2s are the most expensive, and the KD2s are the noisiest.
I swapped my Firestone runflats to Falken Fk452's and am very very happy. Quiter, softer, look better than Pilot Sports in my opinion, not super expensive and a great tire for my DD style. I dont track the car, and dont try to max the handling on every single onramp, but when I give it some stick they seem to do well. If I plan on driving a long distance I put in a patch kit and my AAA card