An official measures the fuel consumption of a prototype car after the competition on day three of the Shell Eco-marathon Challenge Europe at The Ahoy centre in Rotterdam, The Netherlands on Friday, ... more 
An official measures the fuel consumption of a prototype car after the competition on day three of the Shell Eco-marathon Challenge Europe at The Ahoy centre in Rotterdam, The Netherlands on Friday, May 18, 2012. Teams from universities all over Europe have brought their energy efficient cars to compete in the challenge. (Jiri Buller/AP Images for Shell) less 
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Associated Press
Fri, May 18, 2012 1:15 PM EDT