Toyota Motor Co. was the primary beneficiary of the U.S. government's "Cash for Clunkers" program, accounting for three of the top five models purchased by new car buyers, according to a new survey of the auto stimulus program. Market researcher IBISWorld said Monday (Aug. 24), the day the auto sales program ended, that three Toyota models, the Corolla, Camry and Prius ranked first, fourth and fifth in sales, respectively. The Honda Civic (second) and the Ford Focus (third) rounded out the top five.