Go take a look at TCU's defensive stats. They regularly hold opponents to single digits. Only once this season did their opponent even reach the 20s, and that was Oklahoma (tied for the Sooners' season low).
I'm not playing a total because I don't see any great case either direction, but if I had to play one I'd go with the Under.
Have we thought about how much TCU could score on Boise St?
They can rack up some points too. Pretty balanced team here.
Boise St. I thought their D was pretty good, but after a good offense like Nevada can bang on em. Not sure about the O/U