Automotive X-Prize is a car race like no other. 10 million USD price is a challenge to produce a super fuel-efficient vehicles that would be a viable option for use in the real world. some of the finalists in the competition were recently exhibited at the SEMA Auto Show in Las Vegas. The competition is now narrowed to 43 finalists from 10 different countries. cars combines unique design with efficient engines, and other fuel-saving features to try to create the perfect balance of useful and practical.