The Truth About Tire Treadwear - Consumer Reports
Check out the sidewall picture for codes of your tire. I've had original tires wear out before 30K.
I trust Sumter Tire and Auto in Wildwood to be honest with you. I buy most tires at Costco or Sams.
You can also go to TireRack.com to see what tires they recommend for your car. A tire is not a tire.