It would be interesting to see those two parameters plotted against each other.
From the link:
Quote:
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Auto sales peaked in 1985 (11 million) and have been declining at a fairly steady rate since 1999. In 2009, Americans bought just 5.4 million passenger cars. As a result, the median age of a registered vehicle in the U.S. is almost 10 years.
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Maybe cars have just gotten so much better that they don't need to be replaced every three to five years.