The 2006 Speedway Grand Prix was the 61st edition of the official World Championship and the 12th season in the Speedway Grand Prix era used to determine the Speedway World Champion.
The 2014 AMA National Speedway Championship Series was staged over four rounds, which were held at Costa Mesa, Ventura, Industry and Auburn. Billy Janniro took the title, his fifth in total, winning all four rounds.
The 2012 AMA National Speedway Championship Series was staged over a single round, which was held at Auburn on September 28. Billy Hamill took the title, his fifth in total, dropping just one point in his opening ride.
The 2011 AMA National Speedway Championship Series was staged over a single round, which was held at Auburn on September 30. Billy Janniro took the title, his third in total, scoring a maximum in the process.
The 2007 AMA National Speedway Championship Series was staged over three rounds, which were held at Costa Mesa, Auburn and Auburn. Billy Hamill took the title, his third in total, winning two of the rounds in the process.
The 2006 AMA National Speedway Championship Series was staged over three rounds, which were held at Costa Mesa, Auburn and Auburn. Greg Hancock won the title to equal Mike Bast's all-time record. It was also Hancock's fourth successive AMA title.
The 2008 AMA National Speedway Championship Series was staged over three rounds, which were held at Costa Mesa, Auburn and Auburn. Defending champion Billy Hamill only raced in the opening round. In his absence, Billy Janniro won the title for the first time, winning all three rounds in the process. It was the first time neither Greg Hancock or Billy Hamill had won the title since Mike Faria in 1997.
The 2005 AMA National Speedway Championship Series was staged over three rounds, which were held at Auburn, Industry Hills and Auburn. Greg Hancock won the title for a sixth time, and for the third time in succession.
The 2004 AMA National Speedway Championship Series was staged over three rounds, which were held at Auburn, Victorville and Auburn. Greg Hancock won the title for a fifth time, and for the second time in succession.
The 2003 AMA National Speedway Championship Series was staged over two rounds, which were both held at Auburn on July 25 and September 26. Greg Hancock won the title for the fourth time, his first since 2000.
The 2002 AMA National Speedway Championship Series was staged over three rounds, which were held at San Bernardino, Auburn and Auburn. Billy Hamill successfully retained the title.
The 2016 AMA National Speedway Championship Series was staged over four rounds, held at Costa Mesa, Ventura, Industry and Auburn. It was won by Billy Janniro, who beat Max Ruml and Dillon Ruml. It was the seventh title of Janniro's career, and his fourth in-a-row.
The 2015 AMA National Speedway Championship Series was staged over four rounds, which were held at Costa Mesa, Ventura, Industry and Auburn. Billy Janniro took the title, his sixth in total, winning two of the four rounds.
The 2017 AMA National Speedway Championship Series was staged over four rounds, held at Ventura, Santa Maria, Industry and Auburn. It was won by Billy Janniro, who beat Max Ruml and Broc Nicol. It was the eighth title of Janniro's career, and his fifth in-a-row.
The 2018 AMA National Speedway Championship Series was staged over four rounds, held at Prairie City, Ventura, Santa Maria and Industry. It was won by Billy Janniro, who beat Luke Becker and Austin Novratil. It was the ninth title of Janniro's career, taking him clear of Greg Hancock on the all-time list, and his sixth in-a-row.
The 2019 AMA National Speedway Championship Series was staged over three rounds, held at Ventura, Industry, and Auburn. It was won by Billy Janniro, who beat Max Ruml and Gino Manzares. It was the tenth title of Janniro's career, and his seventh in-a-row.
The 2021 AMA National Speedway Championship Series was staged over two rounds, held at Owego, New York and Auburn, California. Three rounds were initially scheduled, however the first round at Greene, New York was cancelled due to poor track conditions. It was also the first championship since 2019, after the 2020 series was not held due to the Covid-19 pandemic.
The 2022 AMA National Speedway Championship Series was staged over three rounds, held at Bakersfield, Industry Hills and Auburn, California.
The 2023 AMA National Speedway Championship Series was staged over three rounds, held at Bakersfield, Industry Hills and Auburn, California.
The 2024 AMA National Speedway Championship Series will be staged over three rounds, held at Bakersfield, Industry Hills and Auburn, California.
