The new Volkswagen XL1 Super Efficient Vehicle (SEV) has been unveiled at the Qatar Motor Show. Pioneering construction techniques, an advanced plug-in hybrid drivetrain and innovative packaging all play a part in allowing the XL1 to return 260 mpg on the combined cycle to set a new benchmark for vehicle efficiency. Powering the XL1 is a compact 800 cc TDI two-cylinder common rail diesel