GM EcoCar Challenge (photos)

At the EcoCar Challenge, held at GM's Desert Proving grounds in Yuma, Arizona, 16 university teams competed for more than $100,000 in cash and prizes to convert a Saturn Vue 2-Mode Hybrid into an even greener machine. To improve fuel economy and reduce well-to-wheel emissions, each team must replace the SUV's existing hybrid engine and transmission with an extended-range, plug-in electric, fuel-cell, or all-electric power train using their choice of B20, E85, or liquid hydrogen fuel. See the students working on their prototypes as they prepare for final testing.