I was musing about tire wear while driving home from work today and it occurred to me that in a perfect world, one would rotate tires exactly four times over the life of a tire. My thinking is that if it's rotated, say, 6 times over the life of the tire, the wear will not be even at the tire's end of life, and thus it could have lasted a bit longer if the wear was more even. Given that OEM tires seem to last only about 28-30K for many people, that would equate to 7K - 7.5K per rotation. On the other hand, if one bought a set of tires that was expected to last, say, 50K miles, the ideal rotation frequency would be 12.5K miles. Is there a flaw in my logic?