"The Opel Eco Speedster tops out at 155 mph (250 km/h) and clocked an average fuel economy of 113 mpg over a 24-hour road test. A combination of low weight (1,445 lbs / 660 kg), minimal drag, mid-engine design, and a 5-speed automatic transmission let the Eco Speedster rip and sip at the same time. Opel built the car to spotlight its ability to make highly-efficient, next-generation diesel cars that are a blast to drive. GM (Opel’s parent company) sadly doesn’t seem particularly interested in sharing such cars with its North American customers. -- http://www.flixxy.com/fuel-economy-performance-car.htm