The PT Cruiser is a front-wheel drive 5-passenger vehicle, classified as a truck in the US by the NHTSA for CAFE fuel economy calculations but as a car by most other metrics. Chrysler specifically designed the PT Cruiser to fit the NHTSA criteria for a light truck in order to bring the average fuel efficiency of the company's truck fleet into compliance with CAFE standards. A turbocharged GT model was introduced for the 2003 model year. A convertible was introduced for the 2005 model year.