I did not know this, thats very interesting SK.
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'06 GS 300AWD comes standard w/run flats. I've been told by the dealer to expect 18-24K max life on the tread. Car does seem to handle very well, but the ride is a bit hard. 3 days after I bought the car, I picked up a nail, the tire presure warning light came on, I was able to drive the car home 25 miles on the run flats at 60MPH w/no prob. So, there is def something to be said about not having to change a flat. I'll decide whether or not to stick w/run flats when I'm ready for new tires.