If they had played better passing teams. Thre best one they've played was #58 Louisville, who went for 343 yds. Up next is MTSU, who hit right around what they've been averaging on the year.
If teams aren't passing on them, they're running on them. BYU has the ability to do both and will be the best offense they've faced by far.
But yards might depend on other things too. If the D gets early stops, that's a shorter field for BYU to score. 50 yd drives instead of 80.