What we drive in the future may not be designed in Detroit, or Tokyo or Stuttgart, but on the college campuses of North America. Teams of students from 17 colleges and universities in the United States and Canada have spent the last three years taking apart models of a Chevrolet Equinox, and re-designing and re-fitting the crossover SUV to get better fuel efficiency than the engineers and designers at General Motors have been able to achieve. It's called Challenge X. So what did these college teams come up with? They came up with bio-diesel, ethanol, hydrogen, hybrid electric, plug-in electric - with most of the teams using two of these energy sources together. The team from Penn State created an Equinox that runs on three fuels: bio-diesel, hydrogen and electric hybrid power. The way it's designed, it's always burning hydrogen and bio-diesel together, and the hybrid motor turns on and off," explained Nate Simmons. The team from San Diego State created a bio-diesel electric hybrid, and transformed the transmission from automatic to manual for even better gas mileage. They were able to boost the EPA rating for the conventional Equinox from a rating of 23 miles per gallon highway up into the low 30s. "We set out to produce the most powerful vehicle in the competition," said faculty advisor James Burns. This year's winner was Mississippi State University, for its bio-diesel hybrid electric design. The MSU vehicle is powered by a 1.9-liter GM direct injection turbo-diesel engine, fueled by bio-diesel (B20). It won for achieving a whopping 38 percent increase in fuel economy over the production-model Equinox.