Tesla delivers there first semi

I did read an article about the semi's video, and the guy commented about the lack of information about the actual speeds. He commented that several times the speed was shown as being below 50 mph, and the first quarter of the video, the speedometer was obscured a lot of the time. I wonder what the average speed was for the route, or did I miss that? How long did it take, which would give you a decent idea of average speed.