Scenes from the Detroit auto show

The Lexus LF-LC concept is introduced at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The BMW i8 concept is displayed at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The Smart For-Us concept pickup is unveiled during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The 2012 Porsche 911 is displayed at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. The 911 goes on sale in the U.S. in February, with the convertibles following a few months later. (AP Photo/Carlos Osorio)

The Chevrolet Camaro Hot Wheels concept is on display at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The Acura NSX Concept is unveiled at the North American International Auto Show, Monday, Jan. 9, 2012, in Detroit. (AP Photo/Tony Ding)

The 2013 Chevrolet Spark is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The Scion drift-racing FR-S unveiled at the North American International Auto Show, Monday, Jan. 9, 2012, in Detroit, Mich. (AP Photo/Tony Ding)

Stefan Jacoby, President and CEO, Volvo Car Corp., debuts the Volvo XC60 Plug-In Hybrid concept car at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The Hyundai Genesis Coupe is unveiled at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The Hyundai Veloster Turbo is displayed at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

A 2013 Ford Fusion is displayed at the Ford exhibit at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

Ford President and CEO Alan Mulally stands next to a 2013 Ford Fusion at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The Acura NSX Concept debuts at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The 2013 Acura ILX luxury compact sedan concept debuts at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The 2013 Acura RDX crossover sport utility vehicle prototype debuts at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

Ian Robertson, BMW Group's head of marketing, introduces the new 2013 MINI Roadster, at the North American International Auto Show, Monday, Jan. 9, 2012, in Detroit. (AP Photo/Tony Ding)

Lexus Division General Manager Mark Templin stands next to the Lexus LF-LC concept is introduced at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The Lexus LF-LC concept is introduced at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The 2013 Audi Q3 Vail is displayed at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

Bentley CEO Wolfgang Durheimer introduces the new 2013 Bentley Continental GT V8, at the North American International Auto Show, Monday, Jan. 9, 2012, in Detroit. (AP Photo/Tony Ding)

The BMW i8 concept is displayed at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The 2013 Volkswagon Jetta Hybrid debuts at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

Dr. Annette Winkler, head of the Smart car company unveils the Smart For-Us concept pickup during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The Smart For-Us concept pickup is unveiled during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

Dr. Dieter Zetsche, Chairman of the Board of Management of Daimler AG and head of Mercedes-Benz Cars stands next to the automaker's 1952 300SL and the company's newest model during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

Dr. Dieter Zetsche, Chairman of the Board of Management of Daimler AG and head of Mercedes-Benz Cars drives a 2013 Mercedes-Benz SL during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The 2013 Mercedes-Benz SL, foreground, is shown on the floor of the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

Porsche AG President and CEO Matthias Müller is driven out in the 2013 911 Cabrio convertible, at the North American International Auto Show, Monday, Jan. 9, 2012, in Detroit, Mich. (AP Photo/Tony Ding)

Chevrolet President North America Mark Reuss introduces the Chevrolet Code 130R Concept Coupe, from left, the 2013 Chevrolet Sonic RS, and the Chevrolet Tru 140S Concept Coupe at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The Chevrolet Code 130R Concept Coupe is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The Chevrolet Tru 140S Concept Coupe is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

Chevrolet President North America Mark Reuss introduces the 2013 Chevrolet Sonic RS at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The 2012 Hyundai Elantra is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. The Hyundai Elantra edged out the Ford Focus and Volkwagen Passat Monday, Jan. 9, 2012, to win the 2012 North American Car of the Year award.(AP Photo/Paul Sancya)

The 2013 Dodge Dart is unveiled at the North American International Auto Show, Monday, Jan. 9, 2012, in Detroit, Mich. (AP Photo/Tony Ding)

The 2013 Ford Fusion is introduced during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

Derrick Kuzak, Ford group vice president, introduces the 2013 Ford Fusion is introduced during the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Carlos Osorio)

The 2013 Toyota Prius v is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The BMW i8 concept is shown at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)

The Volkswagen exhibit shows the 2013 line of automobiles at the North American International Auto Show in Detroit, Monday, Jan. 9, 2012. (AP Photo/Paul Sancya)