The much-anticipated BMW i8 was also on hand to show BMW's vision of a green future. Shown next to its all-electric i3 cousin, the i8 proves four-seaters can be green as well. This range-extended EV will actually be built in 2014, with estimated overall fuel economy of 78 miles per gallon.

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With even suppliers focusing on plug-in electric vehicle technology and other green propulsion systems, this has truly been the year of the city car so far at Frankfurt. But the show isn’t over yet. We’ll be sure to bring you more future tech photos as more visions of our sustainable transportation future are unveiled in Germany this week.

+ Frankfurt Motor Show