Leitzinger spent the 2011 season as a substitute driver when needed and as a third driver during endurance races. As a substitute, Leitzinger ran a total of two ALMS races, one of which was the Lime Rock race in which he and Bill Sweedler finished third in class in the AJR GTC Porsche. The other race was the Road America race in which he drove the PR1/Mathiasen Motorsports LMPC car with Rudy Junco and on his first time ever driving an LMPC car and the first time with the team Leitzinger qualified on pole in class and along with Junco, won the race in class. As a third driver in endurance races Leitzinger drove along with Humaid Al Masaood and Steven Kane in the No. 20 Oryx Dyson Racing car at Laguna Seca and Road Atlanta. At Laguna Seca the 20 car led much of the race and finished in third. In the Petit Le Mans at Road Atlanta the car was sidelined early with a throttle position sensor problem. Shortly after returning to the track something in the left rear of the car broke as Leitzinger rounded turn 1 at about which sent him off the track and hard into the tires ending the day for the 20 car.