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A hostess stands next to a Alfa Romeo 4 C during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Michael Probst) ( Germany Frankfurt Auto Show )

The new Porsche 911 turbo S is displayed during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

A hostess stands next to an Opel car during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Porsche CEO Matthias Mueller, left, and former rally driver Walter Roehrl arrive in the new Porsche 918 hybrid sports car during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Mercedes S-Class Coupe concept car is presented by an multimedia show at the IAA international automobile show on September 10, 2013 in Frankfurt, Germany. The world's largest motor show, the IAA, is held biennially and will run from September 12 to 22, 2013. More than 1.000 exhibitors from 35 countries will present their products during the show. (Photo by Thomas Lohnes/Getty Images) ( 180203770 )

Chairman of the board of german auto giant Daimler AG Dieter Zetsche presents the new Mercedes S-Class Coupe concept car at the IAA international automobile show on September 10, 2013 in Frankfurt, Germany. (Photo by Thomas Lohnes/Getty Images) ( 180203779 )

Chairman of the board of Opel Karl-Thomas Neumann presents the new 'Monza' concept at the IAA international automobile show on September 10, 2013 in Frankfurt, Germany. (Photo by Thomas Lohnes/Getty Images) ( 180205574 )

Audi cars are reflected in a mirror at the booth of Audi during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522745922 )

A model stands beside the Maserati Quattroporte Ermenegildo Zegna at the IAA International Automobile Exhibition on September 10, 2013 in Frankfurt, Germany. The world's biggest motor show, the IAA, is running from September 12 to 22, 2013. (Photo by Thomas Lohnes/Getty Images) ( 180207739 )

A Renault Dezir concept car is displayed during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Porsche CEO Matthias Mueller presents the Porsche 918 hybrid sports car during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Rolls Royce Wraith is presented during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Ferrari president Luca Cordero di Montezemolo presents the new Ferrari 458 Speciale at the IAA International Automobile Exhibition on September 10, 2013 in Frankfurt, Germany. The world's biggest motor show, the IAA, is running from September 12 to 22, 2013. (Photo by Thomas Lohnes/Getty Images) ( 180207745 )

A hostess sits in a Fiat 500 during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Michael Probst) ( Germany Frankfurt Auto Show )

Visitors take a look a the Fiat 500 Living during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Michael Probst) ( Germany Frankfurt Auto Show )

Ferrari President Luca di Montezemolo presents the new Ferrari 458 Speciale during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/dpa, Frank Rumpenhorst) ( Germany Frankfurt Auto Show )

BMW i8 plug-in hybrid sports car is displayed during its premiere at the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Porsche 918 Spyder is displayed during the first press day of the 65th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept. 10, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

German carmaker Volkswagen (VW) new electric car e-golf is displayed during a press conference on September 10, 2013 at the media day of the 65th edition of the IAA (Internationale Automobil Ausstellung) auto fair in Frankfurt am Main, western Germany. The show runs for the public from September 12 to 22. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522741863 )

An S-Class Coupe concept car of Mercedes-Benz is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522743128 )

German carmaker BMW new 4 Series Coupe car is displayed during a press conference on September 10, 2013 at the media day of the 65th edition of the IAA (Internationale Automobil Ausstellung) auto fair in Frankfurt am Main, western Germany. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522740656 )

The new Infiniti Q 30 concept car is displayed during a press conference of Infiniti, the luxury brand of Renault - Nissan, on September 10, 2013 at the media day of the 65th edition of the IAA (Internationale Automobil Ausstellung) auto fair in Frankfurt am Main, western Germany. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522743462 )

The new Infiniti Q 30 concept car is displayed during a press conference of Infiniti, the luxury brand of Renault - Nissan, on September 10, 2013 at the media day of the 65th edition of the IAA (Internationale Automobil Ausstellung) auto fair in Frankfurt am Main, western Germany. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522743450 )

An Audi quattro sport concept hybrid car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522743948 )

An Audi quattro sport concept hybrid car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522743972 )

An Audi Nanuk Quattro concept car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522744145 )

An Audi Nanuk Quattro concept car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522744136 )

An Audi Nanuk Quattro concept car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522744152 )

A Renault Spark SRT-01E FIA Formula E race car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522745192 )

A Renault Spark SRT-01E FIA Formula E race car is presented at the booth of Michelin during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522745195 )

Visitors crowd around Mercedes cars at the booth of Mercedes-Benz during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522746093 )

Ferrari chairman Luca Cordero di Montezemolo poses next to a Ferrari 458 Speciale car during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DPA / FRANK RUMPENHORST /AFP/Getty Images ( 522746361 )

German tennis player Sabine Lisicki poses next to a Peugeot 308 R concept car during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522746792 )

Stephan Winkelmann, president and CEO of Italian car maker Automobili Lamborghini, poses next to a Gallardo LP570-4 Squadra Corse car during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522747012 )

The new Citroen Cactus concept car is presented during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / DANIEL ROLAND/AFP/Getty Images ( 522747401 )

A model poses in an Audi Nanuk Quattro concept car during the media day of the IAA (Internationale Automobil Ausstellung) international motor show in Frankfurt am Main, western Germany, on September 10, 2013. AFP PHOTO / JOHANNES EISELE/AFP/Getty Images ( 522746970 )

Porsche AG CEO Matthias Mueller presents the new Porsche 918 Spyder during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Porsche AG CEO Matthias Mueller presents the new Porsche 918 Spyder during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Seat CEO Juergen Stackmann shows the new Seat Leon ST during a preview of the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The head of French carmaker Peugoet, Maxime Picat, pointing to the new 308 during an interview with the Associated Press on the quality control line at the Peugeot plant in Sochaux, eastern on France Aug. 27, 2013. The car will be presented at the Frankfurt Auto Show running through Sept. 22, 2013. The money-losing French automaker PSA Peugeot Citroen needs this new model to be a winner in the brutal competition among mass-market carmakers in Europe. (AP Photo/Michel Euler) ( Germany Frankfurt Auto Show Hot Ten )

Photo provided by BMW shows the BMW i8 plug-in hybrid sports car that will be presented during the Frankfurt Auto Show running through Sept. 22, 2013. BMW use carbon fiber parts to achieve light weight and quick acceleration _ zero to 100 kph (0-62 mph) in 4.5 seconds. (AP Photo/BMW) ( Germany Frankfurt Auto Show Hot Ten )

Journalists view the i3 electric car by car manufacturer BMW at the Frankfurt Motor Show (IAA) in Frankfurt Main, Germany, Monday, Sept. 9, 2013. The 65th IAA runs Sept 12 through 22, 2013. (AP Photo/dpa, Boris Roessler) ( Germany Frankfurt Auto Show )

The new Volkswagen 2load-up is displayed during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Volkswagen e-Golf displayed during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Volkswagen e-up is displayed during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Audi Nanuk Quatro is on display during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Audi Nanuk Quatro is presented during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Audi CEO Rupert Stadler presents the new Audi Nanuk Quatro during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Audi CEO Rupert Stadler presents the new Audi A3 cabriolet during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Volkswagen CEO Martin Winterkorn poses alongside the new Golf Sportsvan during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Mercdes S 500 intelligent drive is presented during the Mercedes-Benz Media Night at the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Michael Probst) ( Germany Frankfurt Auto Show )

The Volkswagen Group electric cars are on display during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

A cutaway model of the new e-Golf by car manufacturer Volkswagen, VW, is being cleaned by an employee at the Frankfurt Auto Show, IAA, in Frankfurt, Germany, Monday, Sept. 9, 2013 2013. The 65th IAA will take place from Sept. 12 until Sept. 22, 2013. (AP Photo/dpa, Boris Roessler) ( Germany Frankfurt Auto Show )

The Smart "fourjoy" concept car is presented during the Mercedes-Benz/ Smart Media Night the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Michael Probst) ( Germany Frankfurt Auto Show )

A range of Mercedes and Smart cars is presented by CEO of Daimler AG Dieter Zetsche during the Mercedes-Benz Media Night at the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept.22, 2013. (AP Photo/Michael Probst) ( Germany Frankfurt Auto Show )

Wolfgang Schreiber, CEO of Bentley Motors, presents the new Bentley GT V8S during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Porsche AG CEO Matthias Mueller presents the new Porsche 918 Spyder during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Bugatti CEO Wolfgang Schreiber introduces the new Veyron during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

Stephan Winkelmann, CEO of Lamborghini, introduces the new Squadra Course during a preview by the Volkswagen Group prior to the 65th Frankfurt Auto Show in Frankfurt, Germany, Monday, Sept. 9, 2013. More than 1,000 exhibitors will show their products to the public from Sept. 12 through Sept. 22, 2013. (AP Photo/Frank Augstein) ( Germany Frankfurt Auto Show )

The new Opel Monza Concept is presented at the IAA auto show in Frankfurt am Main, central Germany, on September 9, 2013. The world's automobile makers are counting on the IAA auto show, which opens in Frankfurt this week, to give the sector a boost as recovery signs are becoming increasingly discernible in Europe. DANIEL ROLAND/AFP/Getty Images ( 522704918 )

Mark Adams, Vice President of General Motors Europe, presents the new Opel Monza Concept at the IAA auto show in Frankfurt am Main, central Germany, on September 9, 2013. The world's automobile makers are counting on the IAA auto show, which opens in Frankfurt this week, to give the sector a boost as recovery signs are becoming increasingly discernible in Europe. DANIEL ROLAND/AFP/Getty Images ( 522704805 )

Mark Adams, Vice President of General Motors Europe, presents the new Opel Monza Concept at the IAA auto show in Frankfurt am Main, central Germany, on September 9, 2013. The world's automobile makers are counting on the IAA auto show, which opens in Frankfurt this week, to give the sector a boost as recovery signs are becoming increasingly discernible in Europe. DANIEL ROLAND/AFP/Getty Images ( 522704813 )