To see our latest film before it's on YouTube: http://www.carfection.com Subscribe for more XCAR videos: http://bit.ly/U9XDKc The VW XL1 is the most fuel efficient car in the world. VW has revealed the ultra frugal XL1 at Geneva 2013. Behind the StarTrek styling is a radical, lightweight two seater capable of 314mpg while emitting just 21g/km CO2. A 47bhp two-cylinder 800cc TDI engine is backed up
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