I'm pretty much a highway hauler (70 mile one-way commute on I-75). Once the charged battery is depleted, I am seeing about 28-35mpg going 70-75mph. It's still working itself out and winter isn't doing it any favors. Since I do have a long highway commute with hills and occasional braking, the two miles city driving once I exit is pure electric as the battery has charged enough to hit the 35mph speedlimit on the local roads.
I did do a haul down to Indiana last weekend and I was averaging 26 on gas but it was really windy, really icy, and really cold. And I was not going the speed limit
Let me get through this tank and I can provide better numbers.