Boise State is going to factor in the Mountain West Conference and it's because of defense. Only 20 teams yield fewer points per game than the Broncos, who are holding foes to 59 points.  
The Broncos just beat New Mexico, 77-53, on Monday. The Lobos had scored 72, 104 and 90 during their previous three games although that came against extremely weak competition. But it's not just New Mexico. In its previous two games, Boise State held BYU eight points under its scoring average and kept Weber State 21 points under its scoring average. 
Defense should prevail again in this quick rematch since the teams are familiar with each other. New Mexico heavily relies upon Makuach Maluach, who averages 17 points. The Broncos held him to 13 points on 41.7 percent shooting. The Lobos lack any other consistent scorers. 
The Lobos are not a quick pace team so that's another plus for the Under. The Under is 6-0-1 in the Lobos' last seven games. Boise State has been a big Under team, too, with 12 of its last 15 games going below the total, including the last six at home.