http://www.espn.com/college-football/statistics/teamratings/_/tab/efficiency Not too shabby. You can got to 2017 for reference. Team efficiencies are based on the point contributions of each unit to the team's scoring margin, on a per-play basis. The values are adjusted for strength of schedule and down-weighted for "garbage time" (based on win probability). The scale goes from 0 to 100; higher numbers are better and the average is roughly 50 for all categories. Efficiencies update daily during the season.
