I know this has been discussed in this forum before but I want to clarify something.
We got 40k out of our first set of run flats. I went to the tire center (it's all they do) and was told:
- no difference in ride between ride flat and regular tires.
- because of the low profile isn't able to dissipate heat as well as larger tires I can expect 10-15k out of the new set for city driving and double that for highway (that amounts to a set every 12-16 months).
- none of the manufacturers they carry (which is most) offer a low profile tire with guaranteed mileage.
Given the wear would be consistent, I selected a set of high traction tires for $117 / tire which was half the price of the run flats.