run flat tires tend to be very heavy compared to their non runflat counterparts, not to mention that if you get a nail in one, you'll still have to replace the tire, $$$, it just allows you to drive on the run flat for a while without damaging the wheel. Most places will not patch or plug runflats either, you'll need to buy a new one, plus, if there are a few thousand miles on the tires, you might need to purchase a pair of tires (front or rear).
Just carry a can of fix a flat and get AAA, it'd be alot easier and cheaper.
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