Last week we took our RX400h into the dealer for it's 1 year/15000 mile service. The dealer called and said the tires were down to the cord in spots and would need to be replaced. We were shocked, neither my husband and I had noticed this. Believe it or not, Kearny Mesa Lexus told us that they were going to replace the tires as a customer courtesy. It took them an extra day but they put 4 new Michelin MXV4 Energys on the car, no charge. What a great tire, by the way. Possibly Lexus knows about an issue with the OEM tire or the car?