| 3 | Mid Ohio R3 | 5/20/06 | Mid-Ohio Sports Car Course | 20 | 16 |
| 4 | Mid Ohio R4 | 5/21/06 | Mid-Ohio Sports Car Course | | 15 |
| 7 | Cleveland R7 | 6/24/06 | Grand Prix of Cleveland | 29 | 28 |
| 8 | Cleveland R8 | 6/25/06 | Grand Prix of Cleveland | | 23 |
| 9 | Toronto R9 | 7/8/06 | Toronto Street Circuit | 17 | 9 |
| 10 | Toronto R10 | 7/9/06 | Toronto Street Circuit | 14 | 13 |
| 11 | NASA Mid-Ohio R11 | 9/16/06 | Mid-Ohio Sports Car Course | 17 | 16 |
| 12 | NASA Mid-Ohio R12 | 9/17/06 | Mid-Ohio Sports Car Course | 17 | 15 |