X-Prize continues at Michigan International Speedway

The quest for 100 miles per gallon has resumed at Michigan International Speedway.

Since the final round of the Progressive Automotive X Prize started on Monday, a pair of teams that created unconventional cars with traditional racing technology have made bold moves to win their individual classes and pocket much of the competition’s tantalizing $10 million in prize money.

One contender is the Edison2 team’s Very Light Car, a 750-pound seedpod on wheels that burns an ethanol-gasoline blend and unofficially achieved 129 miles per gallon during Thursday’s testing at MIS. Edison2—made up primarily of engineers and mechanics from the world of endurance racing at such tracks as Daytona and Le Mans—stands to win half the prize money if such results continue.