Then, again, I have NEVER had a wheel alignment done after getting 4 new tires. Unless the car has been fitted with new wheels with an offset change, the suspension geometry should not be altered.

I also agree with the cost of the tires and the wear rate. The dealers seldom give you a good 'deal', nor do they take into consideration the driver's driving habits. I always go to TireRack.com and check for tires that fit my needs: noise, grip in wet, and wear. The last consideration is price, which is always much less than the dealer.
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Keeping it running is better than buying new