Car, Volkswagen L1 Concept 2009, Volkswagen concept car pictures. The Volkswagen L1 Concept is unique in the world today. Thanks to a carbon fibre reinforced plastic (CFRP) body, it weighs just 380 kilograms. The two-seater is powered by a new common rail turbo-diesel (two-cylinder TDI) and an electric motor. With its average fuel consumption of 1.49 litres diesel per 100 kilometres, this fully road-ready and extremely aerodynamic L1 is advancing to become the most fuel-efficient hybrid automobile in the world.