That's typical. 22.5-23.5 is what a AWD 2.5L CX5 gets daily driving with mostly highway in my own experience. That said, I still get 30+ doing 35mph in residential areas.
I don't buy that as typical for mostly highway driving. I am averaging 26mpg right now with probably 50/50 driving. Summer I average 27/28. It was stated from that he warms his car up for 10 min as well so that mpg calculation is not accurate.