WOLFSBURG, Germany – In 2012 we reported Volkswagen’s radical UFO-esque XL1 undergoing testing. Despite its radical looks, what really grabbed the automotive world was the German automaker’s claimed fuel consumption for its extraordinary model.The new XL1 two-seater could be the most fuel-efficient production car in the worldat 0.9 litres/100km courtesy of its plug-in hybrid system.TOP SPEED 160KM/HA two-cylinder 35kW turbodiesel engine works with a 20kW electric motor and drives through a five-speed dual clutch auto gearbox. The car will make Greenpeace happy and sniff at any CO2 emissions taxation with a rating of only 21g/km. The XL1 can accelerate to 100km/h in 12.7sec, reach 160km/h and cover as far as 50km in battery mode.IMAGE GALLERYVW has followed sports-car design for the shell with a low weight of 795kg, perfect aerodynamics (Cd 0.189) and a low centre of gravity (1153mm high). This enables the model to cruise on the road at a constant 100km/h using only 6.2kW. In electric mode it requires less than 0.1 kWh/km.Conceptually, the XL1 is the third evolutionary stage of VW’s one-litre car strategy. EVEN THE BOXSTER IS TALLERThe XL1 is 3.8m long and 1.6m wide. By usual automotive standards that's extreme; VW’s Polo has a similar length (3.9m) and width (1682mm) but is significantly taller (1.4m).Even a pure-bred sports car such as sister company Porsche’s Boxster is 129mm taller (1.2m).Unfortunately the new XL1 won’t be headed for our shores any time soon. VW SA’s public relations manager: "There are no plans to introduce XL1 in SA."