We've had ours for a month now and have put gas in four times. The last two were today, after a long road trip.
1st fillup: car averaged 34.5 MPG. Almost all suburban driving, little highway.
2nd fillup: car averaged 32.5 MPG. Again, almost all suburban driving, but this was also during a snowy week so I idled the car a lot to warm him up and defrost him.
We drove from RI to NJ, then drove around NJ in some stop-and-go sububan evening driving. Car averaged 42 MPG.
We then drove from NJ back to RI, almost all highway driving with a little stop-and-go on Route 1 in CT. Car averaged 46.5 MPG.
We're just at 900 miles on the odometer, and supposedly the mileage gets better for a lot of people after 1000, so it'll be interesting to see what happens. But, hey, if I get 32.5-34.5 city and 42-46.5 highway, I won't complain! It's a lot better than my other cars...