The German car manufacturer produces the world's most fuel efficient car, the XL1

If Robert Zemeckis were making the Back To the Future films now, he would use the Volkswagen XL1 for Doc's time machine. Like the 80s DeLorean, this car is what we imagine cars of the future to look like, except the XL1 acts like a car of the future too. It is silver, aerodynamic with gull-wings, camera-based mirrors, but most impressively, it burns less than one liter of fuel for every 100 km (261mpg).

Using a plug-in hybrid system, the two-seater can travel 50km from just battery power, meaning there is zero fuel emission for that distance. To create the winning combination of fuel-efficiency and aerodynamics, the car had to be built incredibly light, so it only weighs in at 1,752 lbs., about half of a typical American midsize sedan.

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