EV mode does not include in the MPG calculations oddly in the car. in the 350h I achieved 45mpg easily. in the 450+ 40 miles easily done on EV only, there are multiple modes, EV, EV+Hybrid, Hybrid, generator.
compared to my 2019 gen 4 450, the economy is miles better, drive is better, power is almost same in the 450+, more responsive, better drive, better finish, just in general much better. My only niggle will be lack of cubbies and lack of essential buttons especially drive modes.