Quoted: Every year since 2004, the figure has dropped, to around 9,400 miles driven last year. “Unlike other past dips in driving, this recent downward shift has had no clear, lasting connection to economic trends or gas prices,” said Chris McCahill of the State Smart Transportation Initiative at the University of Wisconsin. American driving patterns “aren’t as responsive to gas prices as they used to be,” McCahill said. “There’s less elasticity in driving.”