Just finished my first "road trip" in my 18 From CT to NJ on mostly the Merritt Parkway which if any of you know is very twisty and has lots of elevation change. I averaged 35.2 over 314 miles at an average speed of probably around 60 using the ACC. I'm extremely impressed!
So its is not just me that has noted unexpectedly high MPG on a road trip in a 2018. It must have to do with the cylinder deactivation.