The Middle-Eastern playboys parading around London in their bright supercars have been outdone in the wow stakes by a - Volkswagen. Passersby in the capital had to perform a double-take when they saw this two-seat car being driven in the sunshine. The futuristic-looking vehicle is the Volkswagen XL1 - the world's most fuel-efficient hybrid which was unveiled at the Geneva Motor Show earlier this year. With an aerodynamic design and hybrid setup, the XL1 is capable of a staggering 313mpg - while emitting just 21g/km of carbon dioxide.