LT
Through the 2008 season, that is Edgerrin James with 1,709 rushing yards in the 2000 season.
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Adrian Peterson
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Michael Vick rushed for 1039 yards in the 2006 season to set the single season rushing record for quarterbacks.
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The man whom holds this record is Barry Sanders with the Detroit Lions. During the 1997 season, he rushed for 100 yards in 14 of the 16 regular season games.
Steve Grogan holds the NFL record for rushing TDs by a quarterback in a season with 12 in 1976. He scored 35 rushing TDs in his career.