i have a 2006 RX400h it came with Goodyear Eagle Tires they wore out at 17,000 miles
i contacted the dealer and the Lexus Service Center expressing this concern, but the explaination basically was that "tires wear out".
the car had an alignment done at 15,000 miles.
the dealer explained that Goodyear Eagles dont last more than 15-25K miles and the hybrid weight contributes to the tire wear.
my next car probably not be a Lexus, due to the fact that Lexus chose to put racing tires on a family vehicle that resulted in premature tire wear.
regards
chris hu san jose, calif