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i was told be sale person that 2011 are coming with run flats and the all other m's b4 did'nt.the reason for no spare is because if you do start to lose air in any of the tires the car will notify you. Then you will still be able to drive for another 150 miles with the run flats until you can get them fixed.these tires are not suppose to blow out they are steel belted on the side wall of the tire to prevent any blow outs.
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