I was curious too, so I tried to look it up. According to the DOT, it looks like driving mileage has trended downward slightly since a peak in 2007, FWIW. http

I was curious too, so I tried to look it up. According to the DOT, it looks like driving mileage has trended downward slightly since a peak in 2007, FWIW. http://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/publications/national_transportation_statistics/html/table_01_40.html_mfd http://www.rita.dot.gov/bts/sites/rita.dot.gov.bts/files/pub...