Infiniti, maker of luxury vehicles, adds a fourth model to its lineup of luxury performance vehicles with the July introduction of the 1999 Infiniti G20, an all-new fun-to-drive luxury sports sedan. The G20 joins the flagship Q45 luxury performance sedan, I30 luxury sedan and QX4 luxury sport utility vehicle. The newest Infiniti is based on the highly successful European version, called the Primera. The first generation G20 was sold in North America from the 1991 through...