Just following the thread, I noticed your posts concerning tire prices. You might want to check prices at "The Tire Rack." For the tires you mention, The Tire Rack had prices about $50.00 per tire LESS than the prices you quote from Costco. FYI- Michelin Pilot SX GT 235-45-17 for $190.00 each vs. your price of $240 from Costco for the 225's.
I've purchased many, many sets of tires and wheels from them over the last 10+ years, and have never had a problem, nor found a lower price. (I'm currently waiting for my 18" AMG's and Michelin Pilot Sports to arrive later today!)
Just my two cents worth.