The Opel Eco Speedster first wowed crowds at the Paris Auto Show in 2002 and has now popped up in the Discovery Channel’s FutureCar series (see below for the video link). The sleek concept car holds a distinguished place in the growing family of high-performance diesels that are breaking records, as well as people’s prejudices about what diesels can do on the road and the track. The Eco Speedster, with its surprisingly diminutive 1.3-liter ECOTECH CDTI, tops out at 155 mph and clocked an average fuel economy of 113 mpg over a 24-hour road test. A combination of low weight (660 kg/1,445 lbs), minimal drag, mid-engine design, and a 5-speed automatic transmission let the…

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