In 2001, Dodge made its return to NASCAR with the Intrepid. Also that same year, Dale Earnhardt died from a fatal crash at the Daytona 500, leading to NASCAR to make serious safety changes. In 2003, in response to the asymmetrical body of the Taurus in the previous seasons, NASCAR set up new body rules, better known as the "common body templates" rule; as a result, the hood, roof, and decklid were no longer required to be identical to their stock counterparts. In 2004, the sport switched from Unocal 76 fuel to Sunoco. The Gen 4 car was used full time until 2006, and it was retired in the Cup Series after a couple of races in 2007 (in which Toyota, who had already competed in the NASCAR Craftsman Truck Series, made their debut in the Cup and the then-Busch Series with the Camry), while the other races were ran by the fifth-generation Car of Tomorrow. The Car of Tomorrow went full-time in 2008, with the second-tier series adopting their own Car of Tomorrow first part-time in 2010 and full-time the following year.