The picture was taken at 2 different times. The one that says update is when u turn the truck off. The other is when I was almost home and yes I was going 45mph at that point. But the 18.8 was an average of the whole trip up until that point.
Not trying to sugar coat too much. It was I would say 90% highway with cruise set MOST of the time. Only hammered down a couple times to pass people. On my daily country driving of country roads I get about 15mpg but my trips tend to be short under 10-15 miles on average each way. As my truck is breaking in the mpg is improving. And it seems Like the harder I drive it the better mpg I get (that is weird I know)