Mine is probably worst case scenario for this vehicle, and I'm still happy to average 38 mpg (Imp gal). I can't overnight charge, as the strata council for my building won't allow it from common property outlets in the parkade, and I rarely charge at public charge points. In addition, 5 days a week, I drive 150 km per day, 100 of which is at 125kmh on the freeway.
My usual routine is to turn on charge as soon as I reach 100kmh on the highway, and turn it off when I exit. This gives me enough EV range at both ends of my trips to complete my urban deliveries in electric only. I'd dearly love to be able to home charge, to see how that would effect my average, but I'm not selling my home for the lack of an available outlet!