313 miles in a gallonThats one way to beat the fuel increases: Volkswagen unveils sleek new car that does an incredible 313 miles to the gallon IT promises to be the answer to every hard-up motorists dreams. Volkswagen has unveiled the worlds most economical car that it says can travel 313 miles on a gallon of diesel. Emitting just 38 grammes of carbon dioxide per mile travelled, the XL1 Super Efficient Vehicle is also likely to be the vehicle of choice for green enthusiasts. Whats more, Volkswagen chairman Dr Martin Winterhorn has said the XL1 will go on sale in Britain and Germany first at an affordable price. In order to develop the cars innovative exterior, Volkswagen patented a new system for the manufacture of the Carbon Fibre Reinforced Polymer (CFRP) parts on the car called the Resin Transfer Moulding (RTM) process. DM