Volkswagen Design will unveiled XL1 Super Efficient Vehicle at coming Qatar Motorshow 2011; also the world's most economical car that can travel 313 miles on a gallon of diesel. The XL1 car weighs just 795 kg as it is built around a carbon fiber reinforced polymer exterior, and it can accelerate from 0 to 60mph in 11.9 seconds and has a top speed of 99mph.XL1 is just under 4 meters long, the same size as the Polo, and sits lower off the ground than a Lamborghini sports car at 1.18 meter tall.