X-Tracer and ZAP compete for the X Prize. Photos courtesy of Progressive Automotive X Prize After a series of eliminations at Michigan International Speedway over the past several weeks, the original 136 vehicles that qualified to enter the Automotive X Prize were narrowed down to nine final survivors. In this ‘revolution through competition,’ the vehicles aimed for the best super-fuel efficiency — 100 mpg o… Read the full story on TreeHugger
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Automotive X Prize Finalists Race to Top 100 MPGe
