At this year’s NAIAS in Detroit, Volkswagen had a little surprise for us rabid sportscar fans. Their Bluesport Roadster concept is a mid-engined, diesel-powered sportscar that charms with its exquisite exterior and detailed two-seater cockpit.  This sportscar isn’t so much a machine built for speed, but economy.  Sharing its platform with the forthcoming Porsche 914, it should be motivated by a 180 horsepower engine that takes it from 0 to 60 mph in 6.2 seconds, achieves a fuel economy of 35mpg and tops at 140mph.  We wouldn’t mind getting behind the wheel of this one… [via Jalopnik]