Welcome to fuelly, by coincidence, I was watching Niro reviews last night. You should see about 50 to 55 MPG real World, but all depends on your driving style and journey type. Apparently the regen brakes are not as productive as those in a regular hybrid/EV. Looks an interesting car though, best of luck with the new purchase.
50 is acceptable for a large vehicle like that, you may get more in a diesel if they made one. But Considering some hybrids are seriously over-rated in the lab tests, i'd be more than happy with 50, it's not much lower than the official ratings.
To be fair, of the reviews I've read so far, the car journo's are reporting 60-65 MPG, so the real world figure seems pretty good. They also praise the twin clutch gearbox, which has gear change paddles, instead of the awful CVT's some hybrids have.