Beattie Feathers of the Chicago Bears in 1934 (1004 yards).
John Riggins of the Washington Redskins with 24 rushing TDs in the 1983 season.
In Walter Payton's first NFL season (1975) he had 196 rushing attempts for 679 yards and caught 33 passes for 213 yards.
John Henry Johnson with 1141 rushing yards in the 1962 season.
Tony Canadeo with 1052 rushing yards in 1949.
Jim Taylor in 1966 ... he ended up with 8207 career rushing yards for the Packers.
According to nfl.com, the Browns had 250 first downs in the 2006 season. Broken down they had 72 first downs from rushing, 153 first downs from passing, and 25 first downs from penalties.
Adrian Peterson had over 1900 yards as a freshman at Oklahoma
According to Database Football, the Cowboys had 322 first downs in the 1994 season; 136 by rushing, 160 by passing, and 26 by penalty.
In 1998, Terrell Davis became the first Denver Bronco to rush for more than 20 touchdowns in a season, finishing with 2,008 rushing yards and 21 rushing touchdowns. He also had 25 receptions that season for 217 yards and 2 TDs.
According to Pro Football Reference, the Cowboys had 322 first downs in the 1994 regular season, 160 by passing, 136 by rushing, and 26 by penalty.
In 2011, Robert Griffin III had: 4,293 passing yards and 2,254 rushing yards for BaylorThis season(2012) on the Redskins he has: 747 passing yards and 209 rushing yards as of the first 3 weeks of the NFL.
As of the start of the 2007 season, Walter Payton has the second most career rushing yards in NFL history with 16,726. Emmitt Smith is first with 18,355 and Barry Sanders is third with 15,269.