The Atlanta race had an average of 4,586,000 throughout the event, up 1% from last year ... on the FOX Sports stream (which you can get if you get FOX Sports through your provider), the average minute audience was 43,041.
The Busch and ZSmith cars were good at the R&D center. Only penalties from the weekend were a couple of lug nut fines in Xfinity (Sanchez and Creed cars each had one missing lug nut)