The ES330 brochure says (capitals my emphasis) : "Tires fitted with 17 inch wheels are expected to experience greater tire wear than conventional tires. Tire life MAY be substantially less than 20,000 miles, DEPENDING ON DRIVING CONDITIONS.
Solutions are simple:
1. Rotate your tires every 5000 miles. Since you are a conservative driver, you may
get 30,000 miles of life or more if you keep up with the rotations.
2. When tire replacement is necessary, simply buy a long wearing all season tire in the
215/55VR17 tire size and you may get around 50,000 miles of tire life if you keep up with the 5000 mile rotations.
Ultimate solution: Get 16" wheels on ebay and then sell your 17" on ebay
The Lexus salesmen lied to you if he really said all ES330's come to the USA with 17" wheels. Lots come here with 16's. Always remember a Lexus dealer is run by Americans, not the Japanese and there's nothing corporate Lexus can do to change our American automotive industry culture which has always included a number of liers, cheaters and manipulators.
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For what it's worth, since you just purchased the car, see if your dealer will swap out your tires for the Michelins. My dealer did it for me after three weeks at no charge. Just stamped "Goodwill" on my paperwork. :D