Stop in for a cup of coffee

i was thinking that but
I filled up in Pittsburgh on the way out. Filled up in Carlisle before I left and refilled in Pittsburgh. So essentially I got 19 mpg in the mountains but in the flat and downhill in Ohio, I got 17.

Then filled up in Cincinnati otw back and it had dropped to the 17.0z

The 15.5 I know came from hitting rush hour traffic in columbus yesterday but I hit zero traffic today.
I made the trip from my place in PA to Cincinnati several dozen times. I always got better MPG going back to Cinncy. In the mountains of PA you get the advantage of hyper milling. More so going west than east.