I'm constantly debating the same thing. Had PS4S on my M4, and they were awesome. My last several cars(Mini, Porsche, M4, and motorcycles) have not had a spare, just a pump, and slime. Also carry a DynaPlug kit. Never had a problem (knock on wood!). Have you considered the Michelin runflats? I'm thinking about them, also. Not sure what to do, but I definitely do not want to give up that much trunk space.
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