If your tires are aligned properly, they will last several tens of thousands of miles. If the alignment is bad, you'll chew them up in < 10,000 miles. That is why as our spines deteriorate, our facets go because they are being abused by the poor configuration and biomechanics.
Look into z-coil shoes. They have a heel that is constructed with the springy thingy from Maria's bike seat. Some of them look pretty goofy, but the people I know who have them swear by them.
Mark
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