 Complete the following phrase:  The Penske PC-20 was a CART Penske Racing car which competed in the 1991 and 1992 seasons. In 1991, it raced in all seventeen events, scoring 3 wins, two with Rick Mears, and one with Emerson Fittipaldi, placed 4th and 5th at the seasons end respectively. The most remarkable success of the PC-20 was the 