For example --
* Some commenters wonder where the German cars are. Well, turns out they dominate the luxury section.
* Some comments suggest people don't really want to keep luxury cars fifteen years. Sort of validated -- that segment is broken out and has a lower average, but just a few percentage points. Sports cars? Almost no one keeps a sports car. Unless you count the Miata.
* 17.2% of people in the San Francisco-Oakland-San Jose area keep a car more than 15 years. That's higher than any other studied metro area.