The VW Concept Blue Sports premiers in Detroit with the aim of breaking myths about sports cars being heavy, slow and environmentally-unfriendly.

Volkswagen's Concept Blue Sports premieres in Detroit as a study in combining great fuel economy with a sporty drive and looks. The roadster measures some four metres in length but weighs less than 1200 kg (2646 lbs). VW has put a turbo diesel engine in it and that tips the performance scales even more in its favour.

The engine is a 2.0-litre TDI that makes 180 PS (132 kW / 178 bhp) from 4,200rpm and a hefty torque of 350 Nm (258 lb-ft) made from just 1,750 rpm. Said to be capable of a 0-100 km/h time of 6.6 seconds and a top speed of 226 km/h (140 mph), the Blue Sports concept emits just 113 g/km in C02 gasses. It averages 4.3 litres per 100km (54.7 mpg-US/ 66 mpg-UK) in fuel consumption.

Not to be classified as a lightweight with no proper credentials, the car runs on massive 235/35 ZR19 tyres front and 245/35 ZR19 rear. The gearbox is VW's trusted quick-shifting DSG with six forward gears and one reverse.

Technologies adopted are bi-xenon LED headlights outside, a touchscreen that controls infotainment sources inside and an easy-to-use top that can be removed in seconds. Could the Concept Blue Sports be pointing towards a future Scirocco cabriolet? Time will tell.