Here is an update to the U.S. fleet turnover graph.
This graph shows the total number of registered vehicles in the U.S. divided by the sales rate through August 2014 - and gives a turnover ratio for the U.S. fleet (this doesn't tell you the age or the composition of the fleet). Note: the number of registered vehicles is estimated for 2012 through 2014.
The wild swings in 2009 were due to the "cash for clunkers" program.
The estimated ratio for August was just over 14 years - back to a more normal level.
Note: I argued the turnover ratio would "probably decline to 15 or so eventually" and that has happened.
The current sales rate is now near the top (excluding one month spikes) of the '98/'06 auto boom.
Light vehicle sales were at a 17.45 million seasonally adjusted annual rate (SAAR) in August.
I now expect vehicle sales to mostly move sideways over the next few years.