Through the 2009 season, the team that gained the most net yardage offensively is the 2000 St. Louis Rams with 7075. They gained 5232 yards passing and 1843 yards rushing. The 2000 Rams made the playoffs but lost to the Saints in the wildcard round.
As of the start of the 2008 season, the NFL single game record for passing yardage is held by Norm Van Brocklin of the Los Angeles Rams who threw for 554 yards in a game against the New York Yanks in 1951.
2000
Eric Dickerson with 2,105 yards in 1984.
The record for the most passing yards by a college quarterback in his career is held by Timmy Chang. Chang played for University of Hawaii from 2000-2004 and managed to throw for an astonishing 17,072 yards.
Through the 2008 season, the NFL record is 2,186 yards by MarTay Jenkins of the Atlanta Falcons in 2000. He returned 82 kicks for 1 TD and an average of 26.7 yards.
Through the 2008 season, that is Derrick Mason with 2,690 all-purpose yards for the Tennessee Titans in 2000. He had 895 receiving yards, 1 rushing yard, 662 yards on punt returns, and 1,132 yards on kickoff returns.
Through the 2008 season, that is Edgerrin James with 1,709 rushing yards in the 2000 season.
It has been done 10 times by 8 different players, all since 2001.
Ahman Green of the 2003 Packers with 1883 rushing yards and 367 receiving yards.
Dan Marino. Through the 2008 season, Marino has thrown for 400+ yards in 15 games ... 13 in the regular season and 2 in the postseason. Peyton Manning is second all time with 9 ... 7 in the regular season and 2 in the postseason.
O.J. Simpson rushed for 2003 yards in the 1973 season. The Bills starting QB that season was Joe Ferguson and the backup was Dennis Shaw.