Kia introduces the Trackster concept vehicle during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. The show, which is the largest and oldest auto show in the country, opens to the public on February 10. (Photo by Scott Olson/Getty Images)

Lexus displays the LF-LC concept car during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Tony DiSalle, U.S. Marketing Vice President at GMC, introduces the 2013 Acadia during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Dodge displays the 2013 300C during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Mike O'Brien, vice president of product and corporate planning at Hyundai, introduces the 2013 Hyundai Elantra Coupe during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Ford introduces the Shelby Mustang GT500 convertible during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Ford displays the drive train of the F150 Raptor SVT truck during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

A 1953 Chevrolet Corvette sit nose to nose with a 60th anniversary 2013 Corvette 427 Convertible Collectors Edition during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. Unlike the 1953 model which came with a 150-hp Blue Flame six cylinder engine, the Colectors Edition Corvette is powered by a 505-hp, 7.0L (427 cid) LS7 V-8 engine – making it the fastest convertible in Corvette's history. (Photo by Scott Olson/Getty Images)

Nissan introduces the 2013 NV200 commercial van during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Hyundai introduces the 2013 Elantra GT during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)

Julie Etheridge helps Dodge show off the new Dart during the media preview of the Chicago Auto Show at McCormick Place on February 8, 2012 in Chicago, Illinois. (Photo by Scott Olson/Getty Images)