300K out of a Lexus is very possible. When folks start talking cars everybody gets their hackles up. You can have good luck or bad with any of them. I had a 97 GMC that was a total POS. Fortunately warranty covered everything.I got rid of it when the warranty expired. I have a 2002 GMC with 260,000+ miles and it has been supurb. Water pump, alternator and just put on rear brakes. My next one might be another POS.
byc, the mileage you are quoting on yours indicate that you won't live long enough to see it hit 200K which will be 2040AD at the rate you are driving it.
Unless you are under 50yrs old.
Butch