"They didn't do much to stop us; we just stopped ourselves," Manley said.
Auburn's defense rebounded after giving up 671 yards — the most ever yielded by the Tigers — against No. 16 Texas A&M.
New Mexico State didn't score until Tiger Powell's 2-yard run early in the fourth quarter. The Aggies were outgained 475-305.
The Tigers' 7-0 lead at halftime was their first since going up 10-9 on No. 5 LSU on Sept. 22. It came courtesy of Mason's run to cap a 13-play, 89-yard drive.
Fullback Jay Prosch then scored his first career touchdown on a 1-yard run to cap Auburn's opening drive of the second half.
The Tigers also scored on drives of 80, 96 and 77 yards.
Auburn had 311 rushing yards on 45 carries.
"We just felt like we had to be able to do that in this game, particularly as you get in the third or fourth quarter against a team you feel you ought to be able to wear down eventually," Chizik said. "That's kind of the way it unfolded."Auburn powers past New Mexico State 42-7