31 COMPETITORS FOR THE 100 MPG CHALLENGE: The Automotive X-Prize looks to be doing pretty well. Excerpt: “The Automotive X-Prize is designed to get engineers thinking outside the box in terms of fuel economy. The goal is to develop a “commercially viable” vehicle that will get at least 100 mpg. How it’s done is up to the individual teams, but they have to keep production in mind to be eligible. They even have to show a business plan proving that they can sell at least 10,000 units a year.”