Frankfurt Auto Show

Models pose next to DTM race cars at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept.14, 2011. (AP Photo/Michael Probst)

A model stands next to a transparent car showing security components at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept.14, 2011. (AP Photo/Michael Probst)

Jeeps are presented at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept.14, 2011. (AP Photo/Michael Probst)

A model stands next to a Fiat Freemont at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept.14, 2011. (AP Photo/Michael Probst)

A woman seems to hover at a stand of a tire company at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept.14, 2011.(AP Photo/Michael Probst)

The Audi Urban concept car is presented at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept. 14, 2011. (AP Photo/Michael Probst)

A Maserati Kubang is presented at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept. 14, 2011. (AP Photo/Michael Probst)

The Audi Urban concept car is presented at the 64th Frankfurt Auto Show in Frankfurt, Germany, Wednesday, Sept. 14, 2011. (AP Photo/Michael Probst)

Two models pose next to a Chevrolet Malibu at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13, 2011.(AP Photo/Michael Probst)

A Mercedes Benz SLS AMG E Cell car is seen at the press day of the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13,2011.(AP Photo/Michael Probst)

A man makes a phone call behind a Mansory car at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13,2011.(AP Photo/Michael Probst)

People stand around the Mercedes Benz F 125 concept car at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13, 2011. (AP Photo/Michael Probst)

Ferrari CEO Luca di Montezemolo sits in a new Ferrari 458 Spider during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. (AP Photo/dapd, Roberto Pfeil)

The new Fiat Panda is unveiled during the press day at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13, 2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/dapd, Thomas Lohnes)

Renault Nissan CEO Carlos Ghosn poses besides Renault's concept car Frendzy during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public Sept. 15 to Sept. 25, 2011. (AP Photo/dapd, Martin Oeser)

A Porsche 911 Carrera S comes onto the stage during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public Sept. 15 to Sept. 25, 2011. (AP Photo/dapd, Ronald Wittek)

The Ford Evos concept car is presented during the press day at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13,2011.(AP Photo/Michael Probst)

The new Toyota Prius hybrid car is presented during the press day of the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13, 2011.(AP Photo/Michael Probst)

The new Honda Civic is presented during the press day at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13,2011. (AP Photo/Michael Probst)

A Jaguar C X 16 is presented during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public Sept. 15 to Sept. 25, 2011. (AP Photo/dapd, Mario Vedder)

A hostess sits on the Alfa Romea Concept Car 4C during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public Sept. 15 to Sept. 25, 2011. (AP Photo/dapd, Roberto Pfeil)

A hostess stands next to Lamborghini Aventator LP 700 4 during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public Sept. 15 to Sept. 25, 2011. (AP Photo/dapd, Ronald Wittek)

The Volvo You concept car is presented at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13,2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/Michael Probst)

The Volkswagen VW concept car Nils is on display during the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/Frank Augstein)

The new Volkswagen VW up car Buggy version is on display during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/Frank Augstein)

The Mercedes Benz SLS AMG roadster is presented at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13, 2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/Michael Probst)

Opel's new RAKE car is on display during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/Frank Augstein)

CEO of BMW Group Norbert Reithofer sits in the BMW i8 concept car at the 64th Frankfurt Auto Show in Frankfurt, Germany, Tuesday, Sept.13, 2011. The fair opens its doors to the public from Sept.15 through Sept. 25, 2011. (AP Photo/Michael Probst)

Adam Opel CEO Karl Friedrich Stracke introduces the Opel Ampera car during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public from Sept. 15 through Sept. 25, 2011. (AP Photo/Frank Augstein)

The design car Citroen Tubik is on display at the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public from Sept.15 through Sept. 25, 2011. (AP Photo/Frank Augstein)