Just bought my Lexus a month ago and a friend also has one. Sent me to this site as I was having mileage issues. Read the forum post on ISC learning procedure by a very nice chap called lemon. From doing 21 mpg, now doing 36 mpg. A big hello to all and your doing a great job.
Oooops my bad. lemon is a guy on the US lexus club owners. My thanks should go to JBPRX400h for supplying the link. Many apologies