With the push and 'flash' sales that the UTAD has been having this week and last, I would say that is going to drive attendance to somewhere in the 80 to 85k range.
If you ask me it was very smart by the university to do those push sales. Gives the more local (or at least within decent driving distance), casual fan the opportunity to see what Heupel and company are going to be about. If it's the exciting brand of football we expect, then it helps build back that local fan support that UT needs to fill Neyland on game days.