torque, and can work in parallel with the diesel or drive the car independent of it. Fully charged, the XL1 can travel up to on electric power. The XL1 has a curb weight of , and a (a similar drag coefficient to the General Motors EV1 electric car). Frontal area is 1.5 m2 giving a m2. Just 23.2% of the car () is made out of either steel or iron; the drivetrain weighs . The XL1's length and width are similar to the Volkswagen Polo, with a length of and width of . However, the car is much lower with a height of only , and has a coupe-like roofline, reducing interior volume. The design incorporates butterfly doors, with the interior seating layout using a staggered side-by-side arrangement similar to a Smart Fortwo, rather than the previous versions' tandem seating. Performance credentials include a governed top speed of , with acceleration to in 11.9 seconds. Production version In February 2012, Volkswagen confirmed that it would build a limited series of XL1s starting in 2013. The production version of the plug-in diesel-electric hybrid was unveiled at the 2013 Geneva Motor Show. As with the 2011 concept XL1, it is powered by an 800 cm3 two-cylinder diesel engine with and a electric motor. The combined power output is and torque is . Power is delivered to the rear wheels through a seven-speed dual-clutch gearbox. The wheels are fitted with low rolling resistance tyres sized 115/80 R15 (front) and 145/55 R16 (rear). The drag coefficient has increased slightly from 0.186 to 0.189. The production version delivers an all-electric range of , in addition to a 10-litre fuel tank which allows for over of real-life driving until the car needs to be refueled. In February 2013, Volkswagen announced that it expected the XL1 to achieve a fuel consumption of and emissions of 21 g/km of . The test cycle allows for a re-charge of the battery every which results in a high mpg value. Using diesel alone the car is capable of up to . One reviewer found that, in real-life traffic, with air conditioning on and without attempts at hypermiling, the car is able to reliably achieve . Production and sales Production began by mid 2013 and was limited to 250 units. A total of 50 units had been built by early September 2013, and the remaining 200 XL1s were scheduled to be