This might be a poor PR decision and practice of the auto manufacturers.  While run-flat tires can take one a distance and puncture kits might work, that might not be enough for the individual whose auto is stuck by the side of the road and no way to replace a tire.  Granted that car makers are looking for anything to save weight and increase mileage, but there ought to be a limit of common sense.  It is easy to envision a scenario in which a driver is out of luck — for example a tear in the sidewall of a tire.  No run-flat kit is going to fix that.  So, in order to reach regulatory mileage per gallon, the spare tire is sacrificed.  I’ll try not to purchase a vehicle without a spare.

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