21 City/26 highway for the BL and FE is basically the same as my Edge ST (19/26). I understand there is a full time 4WD system here, but the BL/FE are also almost 800 lbs. less than the Edge ST and putting out ~90 hp less.
I didn't expect the BS to match the Escape's mpg numbers (23/31), but this is worse than I was expecting.
If you look at the Ford Edge ST' specs.. we see
FWD: 21 city/29 hwy/24 combined mpg
AWD: 21 city/28 hwy/23 combined mpg
AWD: 19 city/26 hwy/21 combined mpg
4x4: 21 city/26 hwy/23 combined mpg
The Bronco Sport BL/FE is actually 3" taller than the Edge, has a more off-road suspension, and I am assuming are measured with AT tires instead of All Season SUV tires. All of which would contribute to more aerodynamic drag and radial friction, which in turns negatively affect MPG; especially in the highway scenarios at higher speeds.