Must-See Cars at the 2010 Geneva Motor Show

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Hyundai i-flow diesel hybrid concept

What it is: A preview of a potential future small vehicle from Hyundai, featuring a highly exaggerated version of the company's new corporate design language.

Cool features: An awesomely low drag coefficient of 0.25 plus a clean and efficient 1.7-liter turbodiesel engine matched with an electric motor--why isn't this combination already in production? Said to return more than 78 mpg, the i-flow concept also captures energy from solar panels on its roof and exhaust heat.

Bottom line: Hyundai continues to impress with some groundbreaking new designs. And we really hope a diesel hybrid makes it to production in something. It just makes sense.