NEW YORK (AP) -- The X Prize Foundation, best known for its competitions promoting space flights, is offering $10 million to the teams that can produce the most production-ready vehicles that get 100 miles per gallon or more.
X Prize put up a $10 million purse when SpaceShipOne, attached to launch ship, made it into space in 2004.
The foundation was to announce the size of the purse and its sponsor, Progressive Casualty Insurance Co., on Thursday at the New York International Auto Show.
More than 60 teams from nine countries have signed up for the competition so far, including California electric carmakers Aptera Motors and Tesla Motors, German diesel carmaker Loremo and a team from Cornell University.
Teams will be able to sign up through mid-2008, when applicants will be narrowed to those who can prove they would build production-ready, consumer-friendly cars.
Those that qualify will race their vehicles in cross-country races in 2009 and 2010 that will combine speed, distance, urban driving and overall performance.