Was that hand calculated or the dash telling you 19.2.I'm not impressed. I'd expect more mpg. Yesterday I drove about 200 miles from my home to Boston for a baseball️ tournament.
2017 F150 5.0 6 speed got 19.2 mpg. Mostly 75 and 95% highway. I'd expect upper 20' s out of an EV ....
If 26.8 isn't good from a crew cab pickup then I don't know what your measure of good could possibly be. Again this is a hybrid not full EV.