The Audi e-tron, for instance, is an experimental sports coupe that relies on a battery alone to drive four electric motors one for each wheel.

ECONOMIST: Fast cars will go even faster with electric power

Stadler drove out onto the stage at the Las Vegas Hilton in an Audi e-tron Spyder concept car, a hybrid vehicle with two electric motors and a twin-turbo V6 engine, capable of zooming from 0 to 60 in just 4.7 seconds.

FORBES: Audi Touts Tech At CES

Yesterday, AUDI AG chairman Rupert Stadler gave his own keynote address at CES, driving out onto the stage at the Las Vegas Hilton in an Audi e-tron Spyder concept car, a hybrid vehicle with two electric motors and a twin-turbo V6 engine, capable of zooming from 0 to 60 in just 4.7 seconds.

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Ingolstadt, 2012-08-09 -- Audi is set to make driving even safer with a new technology: the digital rear-view mirror delivers brilliant images and is due to enter small-scale production in the Audi R8 e-tron at the end of this year.

ENGADGET: Audi R8 e-tron to feature digital AMOLED rear-view mirror

You don't get the usual rumbling of an idling engine, just the whisper-quiet whirl of the e-tron's motor (Audi is currently engineering an "e-tron sound" so that outsiders will be able to hear the car) and wind whizzing by.

ENGADGET: Audi A3 e-tron hands-on (video) Hands-on

Our Audi representative informed us that the e-tron performs very similar to its sporty TDI.

ENGADGET: Audi A3 e-tron hands-on (video) Hands-on

Audi has shown a series of e-tron-branded electric cars, one of which, the Tesla Roadster-like R8, is going into limited production next year.

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The digital rear-view mirror celebrated its dazzling premiere at the Le Mans 24 Hours in the R18 e-tron quattro and R18 ultra race cars which gave Audi a one-two-three win in the legendary race.

ENGADGET: Audi R8 e-tron to feature digital AMOLED rear-view mirror