The Acura NSX Concept is shown at the 2013 North American International Auto Show media preview at the Cobo Center on Jan. 15, 2013, in Detroit. Approximately 6,000 members of the media from 68 countries are attending the show this year. The 2013 NAIAS opens to the public Jan. 19.

Visitors look over Acura's NSX concept which was developed and manufactured in the United States, during the media preview at the North American International Auto Show on Jan. 15, 2013, in Detroit.

The Acura NSX concept is displayed at the North American International Auto Show in Detroit on Jan. 15, 2013.

The Tesla Model X is displayed at media previews for the North American International Auto Show in Detroit, Tuesday, Jan. 15, 2013.

Franz von Holzhausen, chief designer at Tesla Motors, talks about the doors on the Tesla Model X at media previews for the North American International Auto Show in Detroit on Jan. 15, 2013.

Visitors look over the new Kia Cadenza following its introduction during the media preview at the North American International Auto Show on Jan. 15, 2013, in Detroit.

The Kia Cadenza is unveiled at the North American International Auto Show in Detroit on Jan. 15, 2013.

The Kia Cadenza is unveiled at the North American International Auto Show in Detroit on Jan. 15, 2013.

The Batman-decorated Kia Optima is displayed at the North American International Auto Show in Detroit on Jan. 15, 2013. The comic inspired auto at the South Korean automaker's exhibit was created to promote an effort to fight hunger in Africa. Features include Batman symbols inside and outside on the Optima and was created as part of a partnership involving DC Entertainment.

The 2014 Acura MDX Prototype is revealed at the 2013 North American International Auto Show media preview on Jan. 15, 2013, in Detroit.

The Jaguar SX R-F vehicle is shown at the 2013 North American International Auto Show media preview at the Cobo Center on Jan. 15, 2013, in Detroit.

The Hot Wheels edition of the Chevrolet Camaro sits on an oversized track that appears to swoop down from the ceiling at the North American International Auto Show in Detroit on Jan. 15, 2013. General Motors Co. last year announced it would sell the vehicle with Hot Wheels logos and other toy-inspired touches such as red-lined wheels.

The Cadillac ELR is unveiled during the North American International Auto Show in Detroit on Jan. 15, 2013. The auto show will be open to the public Jan. 19-27.

The Cadillac ELR debuts at media previews for the North American International Auto Show in Detroit on Jan. 15, 2013.

The Ford Atlas concept pickup is unveiled at the North American International Auto Show in Detroit on Jan. 15, 2013.

The Ford Atlas concept pickup is unveiled at the North American International Auto Show in Detroit on Jan. 15, 2013.

The Lexus IS 300h debuts at media previews for the North American International Auto Show in Detroit on Jan. 15, 2013.

The Lexus IS 300h is introduced at the 2013 North American International Auto Show in Detroit, Mich.

The redesigned 2014 Chevrolet Corvette Stingray is introduced the night before press previews start at the 2013 North American International Auto Show in Detroit on Jan. 13, 2013.

The new Corvette Stingray is displayed after its unveiling in Detroit on Jan. 13, 2013, the night before press days at the North American International Auto Show in Detroit.

General Motors unveils its newly redesigned Corvette Stingray in a formal industrial complex on Jan. 13, 2013, the night before press days at the North American International Auto Show in Detroit. When 1,000 GM engineers and designers started work on the next-generation Corvette, they began with the usual priority list for a muscle car. Killer looks. Big engine. Fast. But topping the list was something that belies the roar of the Chevrolet's giant V-8: Gas mileage.

The Nissan Resonance debuts at media previews for the North American International Auto Show in Detroit on Jan. 15, 2013.

Nissan Design's Chief Creative Officer Shiro Nakamura stands with the Nissan Resonance at media previews for the North American International Auto Show in Detroit on Jan. 15, 2013.

A model poses with the 2014 Maserati Quattroporte at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

The 2014 Maserati Quattroporte debuts at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

Hyundai Chief Designer Chris Chapman, right, shows off the Genesis HCD-14 concept car, at the North American International Auto Show on Jan. 14, 2013, in Detroit, Mich.

Toyota introduces the Corolla Furia Concept car at the North American International Auto Show on Jan. 14, 2013, in Detroit.

Toyota unveils its Corolla Furia Concept car during the North American International Auto Show in Detroit on Jan. 14, 2013.

Infiniti introduces the 2014 Q50 to replace their best-selling G sedan at the North American International Auto Show on Jan. 14, 2013 in Detroit, Mich.

The Infiniti Q50 sedan is introduced at the North American International Auto Show on Jan. 14, 2013, in Detroit, Mich.

Infiniti Chief Creative Officer Shiro Nakamura stands next to the newly unveiled Q50 sedan, at the North American International Auto Show on Jan. 14, 2013, in Detroit, Mich.

Mercedes-Benz introduces the 2014 CLA at the North American International Auto Show on Jan. 13, 2013 in Detroit, Mich. The auto show will be open to the public Jan. 19-27.

The Mercedes CLA class is premiered at a press event on the eve of the 2013 North American International Auto Show in Detroit on Jan. 13, 2013.

Mercedes-Benz Chairman Dr. Dieter Zetsche introduces the 2014 CLA at the North American International Auto Show on Jan. 13, 2013, in Detroit. The auto show will be open to the public January 19-27.

The Mercedes-Benz E-400 Hybrid is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

The Mercedes-Benz E-class cabriolet is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

Visitors look over a Mercedes SCG AMG Black Series during the media preview at the North American International Auto Show on Jan. 14, 2013 in Detroit.

Visitors look over a Mercedes SCG AMG Black Series during the media preview at the North American International Auto Show on Jan. 14, 2013 in Detroit.

The Mercedes-Benz SLK250, left, sits on display at the media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

The new Mini John Cooper Works Paceman is unveiled at the North American International Auto Show on Jan. 14, 2013, in Detroit, Mich.

The Mini exhibit appears on display at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

The Audi RS7 debuts at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

The Audi SQ5 debuts at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

Bentley Chairman and CEO Wolfgang Schreiber unveils the GT Speed Convertible during the North American International Auto Show in Detroit on Jan. 14, 2013.

Bentley Chairman and CEO Wolfgang Schreiber unveils the GT Speed Convertible during the North American International Auto Show in Detroit on Jan. 14, 2013.

The Bentley Continental GT Speed Convertible is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

The new Lincoln MKC crossover concept vehicle makes its world debut at the media preview of the 2013 North American International Auto Show at the Cobo Center on Jan. 14, 2013 in Detroit, Mich. Approximately 6,000 members of the media from 68 countries are attending the show this year. The 2013 NAIAS opens to the public Jan. 19.

The 2014 Lincoln MKC Concept cross-over SUV is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

Cars are displayed at the Jaguar exhibit at the 2013 North American International Auto Show media preview at the Cobo Center on Jan. 14, 2013 in Detroit, Mich.

People visit the Fiat exhibit at the 2013 North American International Auto Show media preview at the Cobo Center on Jan. 14, 2013, in Detroit, Mich.

The BMW 4 Series Coupe Concept appears on display at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.

The BMW 4 Series Coupe concept vehicle is unveiled at the North American International Auto Show, Monday, Jan. 14, 2013, in Detroit, Mich.

The BMW 4 Series Coupe concept vehicle is unveiled at the North American International Auto Show on Jan. 14, 2013, in Detroit.

The BMW Z4 sDrive is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

The 2013 Jeep Compass is introduced at the North American International Auto Show on Jan. 14, 2013, in Detroit, Mich.

The 2014 Jeep Compass is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

The 2014 Jeep Grand Cherokee is introduced at the North American International Auto Show on Jan. 14, 2013, in Detroit, Mich.

The 2014 Jeep Grand Cherokee revised design is introduced at the 2013 North American International Auto Show in Detroit on Jan. 14, 2013.

Angel Palizio dusts a Kia Soul with the DC Comics package during the media preview at the North American International Auto Show on Jan. 14, 2013 in Detroit.

The Volkswagen CrossBlue SUV is unveiled during the North American International Auto Show in Detroit on Jan. 14, 2013.

VIA Motors' Bob Lutz, left, introduces Pacific Gas & Electric Company's extended range electric sports utility vehicle manufactured by VIA Motors during a news conference on Jan. 14, 2013, at the North American International Auto Show in Detroit.

Fred Diaz, president and CEO, Ram Truck Brand, stands with the Ram 1500 after the vehicle was awarded the North American Truck of the Year at media previews for the North American International Auto Show in Detroit on Jan. 14, 2013.