A study done by the Dr. Michael Sivak, the director at the Sustainable Worldwide Transportation in the University of Michigan Transportation Research Institute (UMTRI), discovered that while fuel economy has improved greatly from 1970-2010, the improvement is greatly undercut due to the amount of people who drive more often and with less passengers in their cars. The study showed that the fuel economy for the entire fleet of light duty vehicles improved by 40%, from 13 mpg to 21.6 mpg, but the vehicle load (number of occupants) decreased from 1.9 persons per vehicle to about 1.38 persons.
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