When my FEH was new, and more importantly, when I was new at driving it, I was getting about the same at both city and highway. Later, I learned how to "optimize" my city driving, and city MPG sky-rocketed, but there's not a lot one can do to raise up the high speed highway driving.

My average is so low below, because I do mostly highway.
I do about 3000 miles of highway, and 200 miles of city per month.

On those city trips ( always more than 5 miles, so engine does get "hot" ) I can approach 50 MPG. 40 is easy. 50 takes concentration. It's hard to beat 30 MPG if your trips are short. A cold engine and/or battery = low MPG.

Still, I can't do better than most ( 33mpg? 34MPG? ) on highway. There's just no way to avoid all that wind resistance.