Promising both outstanding fuel economy and plenty of driving thrills, the Volkswagen Concept BlueSport features a mid-mounted 170-bhp 2.0-liter turbodiesel in a sleek 2-seat roadster. The engine's tremendous torque, 258 lb.-ft., enables the BlueSport to sprint to 60 mph in 6.2 seconds and yet have a highway fuel economy of 50 mpg. With an 18.5 gallon tank, this VW can go a whopping 710 miles between fillups.