| 6.1.2013 | Daytona Test | 01 | Mk XXVI | Pruett / Rojas / Montoya / Kimball | Chip Ganassi Racing with Felix Sabates | 4th |
| 6.1.2013 | Daytona Test | 02 | Mk XXVI | Pruett / Franchitti / McMurray / Hand / Dixon | Chip Ganassi Racing with Felix Sabates | 5th |
| 6.1.2013 | Daytona Test | 2 | Mk XXVI | Dalziel / Popow / Bourdais / McNish | Starworks Motorsport | 6th |
| 6.1.2013 | Daytona Test | 6 | Mk XXVI | Cumming / Valiante / Goncalvez / Yacaman | Michael Shank Racing | 1st |
| 6.1.2013 | Daytona Test | 8 | Mk XXVI | Tagliani / Charouz / Bellarosa / Hartley | Starworks Motorsport | 11th |
| 6.1.2013 | Daytona Test | 27 | Mk XI | Anassis / Massari / Peterson | BTE Sport | 16th |
| 6.1.2013 | Daytona Test | 42 | Mk XXVI | Pagenaud / Cameron / Nonnamaker | Team Sahlen | 2nd |
| 6.1.2013 | Daytona Test | 43 | Mk XXVI | Sahlen / Drissi / Junqueira / Nonnamaker / Nonnamaker | Team Sahlen | 15th |
| 6.1.2013 | Daytona Test | 50 | Mk XXVI | de Quesada / Pace / Defoor / Beck / James | Highway to Help | 17th |
| 6.1.2013 | Daytona Test | 60 | Mk XXVI | Pew / Negri / Allmendinger / Wilson / Ambrose | Michael Shank Racing | 3rd |
| 27.1.2013 | 24 h Daytona | 01 | Mk XXVI | Pruett / Rojas / Montoya / Kimball | Chip Ganassi Racing with Felix Sabates | 1st |
| 27.1.2013 | 24 h Daytona | 02 | Mk XXVI | Franchitti / McMurray / Hand / Dixon | Chip Ganassi Racing with Felix Sabates | 37th |
| 27.1.2013 | 24 h Daytona | 2 | Mk XXVI | Dalziel / Popow / Bourdais / McNish | Starworks with Alex Popow | 6th |
| 27.1.2013 | 24 h Daytona | 6 | Mk XXVI | Cumming / Valiante / Goncalvez / Yacaman | Michael Shank Racing | 41st |
| 27.1.2013 | 24 h Daytona | 8 | Mk XXVI | Charouz / Bellarosa / Hartley / Ardagna / Mayer | Starworks Motorsport | 43rd |
| 27.1.2013 | 24 h Daytona | 27 | Mk XI | Anassis / Massari / Kasemets | BTE Sport | 47th |
| 27.1.2013 | 24 h Daytona | 42 | Mk XXVI | Pagenaud / Cameron / Nonnamaker | Team Sahlen | 21st |
| 27.1.2013 | 24 h Daytona | 43 | Mk XXVI | Sahlen / Drissi / Nonnamaker / Junqueira / Nonnamaker | Team Sahlen | 44th |
| 27.1.2013 | 24 h Daytona | 50 | Mk XXVI | de Quesada / Pace / Defoor / Beck / James | Highway to Help | 40th |
| 27.1.2013 | 24 h Daytona | 60 | Mk XXVI | Pew / Negri / Allmendinger / Wilson / Ambrose | Michael Shank Racing | 3rd |
| 2.3.2013 | 2 h 45 min Austin | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing / with Felix Sabates | 3rd |
| 2.3.2013 | 2 h 45 min Austin | 2 | Mk XXVI | Dalziel / Popow | Starworks Motorsport | 2nd |
| 2.3.2013 | 2 h 45 min Austin | 6 | Mk XXVI | Yacaman / Pizzonia | Michael Shank Racing | 7th |
| 2.3.2013 | 2 h 45 min Austin | 8 | Mk XXVI | Hartley / Mayer | Starworks Motorsport | 27th |
| 2.3.2013 | 2 h 45 min Austin | 27 | Mk XI | Anassis / Massari | BTE Sport | 12th |
| 2.3.2013 | 2 h 45 min Austin | 42 | Mk XXVI | Nonnamaker / Cameron | Team Sahlen | 8th |
| 2.3.2013 | 2 h 45 min Austin | 43 | Mk XXVI | Nonnamaker / Nonnamaker | Team Sahlen | 33rd |
| 2.3.2013 | 2 h 45 min Austin | 60 | Mk XXVI | Pew / Negri | Michael Shank Racing | 34th |
| 6.4.2013 | 2 h Barber | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing with Felix Sabates | 4th |
| 6.4.2013 | 2 h Barber | 2 | Mk XXVI | Dalziel / Popow | Starworks Motorsport | 6th |
| 6.4.2013 | 2 h Barber | 6 | Mk XXVI | Pizzonia / Yacaman | Michael Shank Racing | 5th |
| 6.4.2013 | 2 h Barber | 8 | Mk XXVI | Hartley / Mayer | Starworks Motorsport | 12th |
| 6.4.2013 | 2 h Barber | 42 | Mk XXVI | Nonnamaker / Cameron | Team Sahlen | 7th |
| 6.4.2013 | 2 h Barber | 43 | Mk XXVI | Nonnamaker / Nonnamaker | Team Sahlen | 13th |
| 6.4.2013 | 2 h Barber | 60 | Mk XXVI | Valiante / Pew | Michael Shank Racing | 8th |
| 20.4.2013 | 2 h 45 min Road Atlanta | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing with Felix Sabates | 1st |
| 20.4.2013 | 2 h 45 min Road Atlanta | 2 | Mk XXVI | Dalziel / Popow | Starworks Motorsport | 2nd |
| 20.4.2013 | 2 h 45 min Road Atlanta | 6 | Mk XXVI | Yacaman / Pizzonia | Michael Shank Racing | 4th |
| 20.4.2013 | 2 h 45 min Road Atlanta | 8 | Mk XXVI | Hartley / Legge / Mayer | Starworks Motorsport | 10th |
| 20.4.2013 | 2 h 45 min Road Atlanta | 42 | Mk XXVI | Nonnamaker / Cameron | Team Sahlen | 26th |
| 20.4.2013 | 2 h 45 min Road Atlanta | 43 | Mk XXVI | Nonnamaker / Nonnamaker | Team Sahlen | 11th |
| 20.4.2013 | 2 h 45 min Road Atlanta | 60 | Mk XXVI | Pew / Valiante | Michael Shank Racing | 7th |
| 11.5.2013 | Britcar GT Silverstone | 9 | Mk XXII TDC | Mustill / Berridge / Martin | Wessex Vehicles | 10th |
| 1.6.2013 | 2 h Detroit | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing with Felix Sabates | 25th |
| 1.6.2013 | 2 h Detroit | 2 | Mk XXVI | Dalziel / Popow | Starworks Motorsport | 3rd |
| 1.6.2013 | 2 h Detroit | 6 | Mk XXVI | Pizzonia / Yacaman | Michael Shank Racing | 7th |
| 1.6.2013 | 2 h Detroit | 8 | Mk XXVI | Hartley / Mayer | Starworks Motorsport | 8th |
| 1.6.2013 | 2 h Detroit | 42 | Mk XXVI | Nonnamaker / Cameron | Team Sahlen | 4th |
| 1.6.2013 | 2 h Detroit | 43 | Mk XXVI | Nonnamaker / Nonnamaker | Team Sahlen | 9th |
| 1.6.2013 | 2 h Detroit | 60 | Mk XXVI | Pew / Valiante | Michael Shank Racing | 26th |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing with Felix Sabates | 21st |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 2 | Mk XXVI | Dalziel / Popow | Starworks Motorsport | 3rd |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 6 | Mk XXVI | Yacaman | Michael Shank Racing | 27th |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 8 | Mk XXVI | Hartley / Mayer | Starworks Motorsport | 10th |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 42 | Mk XXVI | Nonnamaker / Cameron | Team Sahlen | 8th |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 43 | Mk XXVI | Sahlen / Nonnamaker / Nonnamaker | Team Sahlen | 22nd |
| 15.6.2013 | 2 h 45 min Mid-Ohio | 60 | Mk XXVI | Pew / Negri | Michael Shank Racing | 4th |
| 30.6.2013 | 6 h Watkins Glen | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing with Felix Sabates | 7th |
| 30.6.2013 | 6 h Watkins Glen | 2 | Mk XXVI | Dalziel / Popow / Bourdais | Starworks Motorsport | 8th |
| 30.6.2013 | 6 h Watkins Glen | 6 | Mk XXVI | Yacaman / Wilson | Michael Shank Racing | 6th |
| 30.6.2013 | 6 h Watkins Glen | 8 | Mk XXVI | Kaffer / Hartley / Mayer | Starworks Motorsport | 3rd |
| 30.6.2013 | 6 h Watkins Glen | 42 | Mk XXVI | Wilkins / Cameron / Nonnamaker | Team Sahlen | 12th |
| 30.6.2013 | 6 h Watkins Glen | 43 | Mk XXVI | Wilkins / Sahlen / Nonnamaker / Nonnamaker | Team Sahlen | 15th |
| 30.6.2013 | 6 h Watkins Glen | 60 | Mk XXVI | Pew / Negri | Michael Shank Racing | 4th |
| 26.7.2013 | 3 h Indianapolis | 01 | Mk XXVI | Pruett / Rojas | Chip Ganassi Racing with Felix Sabates | 2nd |
| 26.7.2013 | 3 h Indianapolis | 02 | Mk XXVI | Kanaan / Hand | Chip Ganassi Racing with Felix Sabates | 9th |
| 26.7.2013 | 3 h Indianapolis | 2 | Mk XXVI | Dalziel / Popow | Starworks Motorsport | 1st |
| 26.7.2013 | 3 h Indianapolis | 6 | Mk XXVI | Yacaman / Allmendinger | Michael Shank Racing | 10th |
| 26.7.2013 | 3 h Indianapolis | 42 | Mk XXVI | Nonnamaker / Cameron | Team Sahlen | 12th |
| 26.7.2013 | 3 h Indianapolis | 43 | Mk XXVI | Nonnamaker / Nonnamaker | Team Sahlen | 13th |
| 26.7.2013 | 3 h Indianapolis | 60 | Mk XXVI | Pew / Negri | Michael Shank Racing | 7th |