1999 (Champion: Elliott Forbes-Robinson)
- Sebring 12 Hours (USA), Mar 20
- Atlanta (USA), Apr 18
- Mosport (CDN), Jun 27
- Sears Point (USA), Jul 25
- Portland (USA), Aug 1
- Road Atlanta – PLM (USA), Sep 18
- Laguna Seca (USA), Oct 10
- Las Vegas (USA), Nov 7
2000 (Champion: Allan McNish)
- Sebring 12 Hours (USA), Mar 18
- Charlotte (USA), Apr 1
- Silverstone (GB), May 13
- Nurburgring (D), Jul 9
- Sears Point (USA), Jul 23
- Mosport (CDN), Aug 6
- Texas (USA), Sep 2
- Portland (USA), Sep 10
- Road Atlanta – PLM (USA), Sep 30
- Laguna Seca (USA), Oct 15
- Las Vegas (USA), Oct 29
- Adelaide (AUS), Dec 31
2001 (Champion: Emanuele Pirro)
- Texas (USA), Mar 4
- Sebring 12 Hours (USA), Mar 17
- Donington Park (GB), Apr 14
- Jarama (E), May 20
- Sears Point (USA), Jul 22
- Portland (USA), Aug 5
- Mosport (CDN), Aug 19
- Mid-Ohio (USA), Aug 25
Highlights: 2001 Grand Prix of Mid-Ohio - Laguna Seca (USA), Sep 9
- Road Atlanta – PLM (USA), Oct 6
2002 (Champion: Tom Kristensen)
- Sebring 12 Hours (USA), Mar 16
- Sears Point (USA), May 19
- Mid-Ohio (USA), Jun 30
- Road America (USA), Jul 7
- Washington (USA), Jul 21
- Trois-Rivieres (CDN), Aug 3
- Mosport (CDN), Aug 18
- Laguna Seca (USA), Sep 22
- Miami (USA), Oct 5
- Road Atlanta – PLM (USA), Oct 12
2003 (Champions: Frank Biela/Marco Werner)
- Sebring 12 Hours (USA), Mar 15
- Road Atlanta (USA), Jun 29
- Sears Point (USA), Jul 27
- Trois-Rivieres (CDN), Aug 3
- Mosport (CDN), Aug 17
- Road America (USA), Aug 24
- Laguna Seca (USA), Sep 7
- Miami (USA), Sep 27
- Road Atlanta – PLM (USA), Oct 18
2004 (Champions: JJ Lehto/Marco Werner)
- Sebring 12 Hours (USA), Mar 20
- Mid-Ohio (USA), Jun 27
- Lime Rock (USA), Jul 5
- Sears Point (USA), Jul 18
- Portland (USA), Jul 25
- Mosport (CDN), Aug 8
- Road America (USA), Aug 22
- Road Atlanta – PLM (USA), Sep 25
- Laguna Seca (USA), Oct 17
2005 (Champions: Frank Biela/Emanuele Pirro)
- Sebring 12 Hours (USA), Mar 19
- Road Atlanta (USA), Apr 17
- Mid-Ohio (USA), May 22
- Lime Rock (USA), Jul 4
- Sears Point (USA), Jul 17
- Portland (USA), Jul 31
- Road America (USA), Aug 21
- Mosport (CDN), Sep 4
- Road Atlanta – PLM (USA), Oct 1
- Laguna Seca (USA), Oct 16
2006 (Champions: Rinaldo Capello/Allan McNish)
- Sebring 12 Hours (USA), Mar 18
- Houston (USA), May 12
- Mid-Ohio (USA), May 21
- Lime Rock (USA), Jul 1
- Salt Lake City (USA), Jul 15
- Portland (USA), Jul 22
- Road America (USA), Aug 20
- Mosport (CDN), Sep 3
- Road Atlanta – PLM (USA), Sep 30
- Laguna Seca (USA), Oct 21
2007 (Champions: Rinaldo Capello/Allan McNish)
- Sebring 12 Hours (USA), Mar 17
- St Petersburg (USA), Mar 31
- Long Beach (USA), Apr 14
- Houston (USA), Apr 21
- Salt Lake City (USA), May 19
- Lime Rock (USA), Jul 7
- Mid-Ohio (USA), Jul 21
- Road America (USA), Aug 11
- Mosport (CDN), Aug 26
- Detroit (USA), Sep 1
- Road Atlanta – PLM (USA), Oct 6
- Laguna Seca (USA), Oct 20
2008 (Champions: Lucas Luhr/Marco Werner)
- Sebring 12 Hours (USA), Mar 15
- St Petersburg (USA), Apr 5
- Long Beach (USA), Apr 19
- Salt Lake (USA), May 18
- Lime Rock (USA), Jul 12
- Mid-Ohio (USA), Jul 19
- Road America (USA), Aug 9
- Mosport (CDN), Aug 24
- Detroit (USA), Aug 30
- Road Atlanta – PLM (USA), Oct 4
- Laguna Seca (USA), Oct 18
2009 (Champions: David Brabham/Scott Sharp)
- Sebring 12 Hours (USA), Mar 21
- St Petersburg (USA), Apr 4
- Long Beach (USA), Apr 18
- Salt Lake (USA), May 17
- Lime Rock (USA), Jul 18
- Mid-Ohio (USA), Aug 8
- Road America (USA), Aug 16
- Mosport (CDN), Aug 30
- Road Atlanta – PLM (USA), Sep 26
- Laguna Seca (USA), Oct 10
2010 (Champions: David Brabham/Simon Pagenaud)
- Sebring 12 Hours (USA), Mar 20
- Long Beach (USA), Apr 17
- Laguna Seca (USA), May 22
- Salt Lake (USA), Jul 11
- Lime Rock (USA), Jul 24
- Mid-Ohio (USA), Aug 7
- Road America (USA), Aug 22
- Mosport (CDN), Aug 29
- Road Atlanta – PLM (USA), Oct 2
2011 (Champions: Chris Dyson/Guy Smith)
- Sebring 12 Hours (USA), Mar 19
- Long Beach (USA), Apr 16
- Lime Rock (USA), Jul 9
- Mosport (CDN), Jul 24
- Mid-Ohio (USA), Aug 6
- Road America (USA), Aug 20
- Baltimore (USA), Sep 3
- Laguna Seca (USA), Sep 17
- Road Atlanta – PLM (USA), Oct 1
2012 (Champions: Klaus Graf/Lucas Luhr)
- Sebring 12 Hours (USA), Mar 17
- Long Beach (USA), Apr 14
- Laguna Seca (USA), May 12
- Lime Rock (USA), Jul 7
- Mosport (CDN), Jul 22
- Mid-Ohio (USA), Aug 4
- Road America (USA), Aug 18
- Baltimore (USA), Sep 15
- Virginia (USA), Oct 20
- Road Atlanta – PLM (USA), Oct 20
2013 (Champions: Klaus Graf/Lucas Luhr)
- Sebring 12 Hours (USA), Mar 16
- Long Beach (USA), Apr 20
- Laguna Seca (USA), May 11
- Lime Rock (USA), Jul 6
- Mosport (CDN), Jul 21
- Road America (USA), Aug 11
- Baltimore (USA), Aug 31
- Austin (USA), Sep 21
- Virginia (USA), Oct 5
- Road Atlanta – PLM (USA), Oct 19