Tokyo Motor Show

Takashi Yamanouchi, president of Mazda Motor Corp., speaks during a press briefing of the Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

Takashi Yamanouchi, president of Mazda Motor Corp., poses for photo with Mazda's concept Car Takeri during the press preview of Tokyo Motor Show in Tokyo,Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

A model sits on Suzuki Motor Corp.,'s concept car Q Concept during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

A model poses near Suzuki Motor Corp.,'s concept car Q Concept during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

Mitsubishi Motors Corp. President Osamu Masuko poses with the company's concept car PX MIE2 during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Itsuo Inouye)

Mitsubishi Motors Corp. President Osamu Masuko poses with concept car PX MIE2 during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Itsuo Inouye)

Nissan Motor Co. President and Chief Executive Carlos Ghosn gives thumbs up sign from the company's concept car PIVO3 during the 42nd Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. (AP Photo/Itsuo Inouye)

Honda Motor Co. President Takanobu Ito stands near Honda's human shaped robot Asimo at a press conference during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

Honda Motor Co. President Takanobu Ito poses for photo with the company's concept car AC X at the press conference during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

Honda Motor Co. President Takanobu Ito speaks near the company's concept model RC E at the press conference during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

Honda Motor Co. President Takanobu Ito reacts in front of the screen airing video footage of himself, right, at the press conference during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

Akio Toyoda, president of Toyota Motor Corp., speaks in front of Prius PHV at the press conference during the press preview of Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. The Tokyo Motor Show opens to the public this weekend. (AP Photo/Koji Sasahara)

A model poses by Toray's concept Electric Vehicle (EV) TEEWAVE AR1 at the Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. (AP Photo/Koji Sasahara)

A visitor snaps Daihatsu Motor Co., concept car FC SHO CASE on displays during the Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. (AP Photo/Koji Sasahara)

People gather around new models and concept vehicles of auto industries during a press preview of the Tokyo Motor Show in Tokyo, Wednesday, Nov. 30, 2011. (AP Photo/Koji Sasahara)