I just got a new '13 Cruze about 2 weeks ago. I was very impressed with the advertised fuel mileage. So far, I'm getting anywhere between 25 - 28 MPG with mixed city (a lot of traffic lights) and highway driving. I thought I would do a little better - somewhere around 30. I had a '10 Malibu that did just a little worse - around 22-24 mixed driving and that's a much bigger and heavier car.
The car is still breaking in - only have about 350 miles, so I'm sure it will improve as time goes on. I remember it improved with my Malibu after it broke in.