Fuel Efficient Cars

Here's a daunting thought in this age of rapid technological advancement. Fuel economy in the U.S. vehicle fleet has changed little since the days of the Ford Model T. In a recent study, Michael Sivak and Omer Tsimhoni at the University of Michigan Transportation Research Institute calculated the distance driven and fuel consumed for the U.S. fleet of vehicles – including cars, light trucks, buses and heavy trucks – between 1923 and 2006...