Spied: 2014 Volkswagen XL1

VW is keeping its promise to put the world's most fuel efficient car into production. The XL1 concept, first shown at the Qatar Motor Show in January last year, can return 313mpg, and you'll be able to buy one next year.Speaking at the concept's unveiling last year, VW Chairman Martin Winterkorn confirmed the XL1 would be going into limited production and on sale by 2013 - and these spy