Yinger had 193 yards and a score and Ruffing, whose previous best was 55 yards, 186 and three touchdowns, including a 57-yarder with 7:54 remaining that put the game out of reach.
Dayton (4-2, 2-1 Pioneer) kicker William Will's three field goals, including a career-tying 49-yarder, set a school career record with 49, which also tied former NFL kicker Billy Cundiff (Drake) for the league record.
Austin Gahafer was 22 of 47 for 418 yards, an interception and four touchdowns, giving him a school-record 73 passing TDs. His final scoring pass was an 86-yarder to Darius Pritchett to get the Eagles (2-4, 2-1) within 37-27 with 11: 21 left.
Pritchett finished with 185 yards receiving and two scores. Jake Raymond reached 2,556 yards receiving, a school record.
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Texas State fires coach Everett Withers
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No. 1 North Dakota St. tops FCS playoff bracket as CAA gets in record six teams
CAA Football set an FCS playoff record by getting in six teams on the bracket, but North Dakota State's dynasty will be pursuing an even bigger mark in the 24-team field.