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"Though February 2008 showed a modest 1 billion mile increase over February 2007, cumulative VMT has fallen by 17.3 billion miles since November 2006. Total VMT in the United States for 2006, the most recent year for which such data are available, topped 3 trillion miles.
"Additionally, the U.S. Department of Transportation estimated that greenhouse gas emissions fell by an estimated 9 million metric tons for the first quarter of 2008.
The estimated data show that VMT on all U.S. public roads have dropped since 2006." (via)