We've all seen the photos and videos of BMW's Vision EfficientDynamics concept for a few weeks now, but even that level of familiarity isn't enough to dull the impact of the car's appearance from arm's length.

Live shots from the floor of the Frankfurt auto show reveal the Vision concept to be as much about design as it is about efficiency, and it's serious about efficiency.

The concept is powered by a 1.5-liter, 163-horsepower three-cylinder turbodiesel with two electric motors (one for each axle) powered by a lithium-ion battery pack. Together, the whole system delivers 390 horsepower and 590 pound-feet of torque. This hybrid drive system isn't the only efficient aspect of the car, however.

It's also good for just 50 grams of CO2 emissions per kilometer (though, of course, they're variable, since this is a plug-in hybrid design), and it's good for 31 miles on electricity alone.

For the full skinny on the Vision EfficientDynamics Concept, check out our coverage of its initial release.