I had a Jetta. I averaged 23 mpg with a considerable amount of highway driving and long drives. In your situation, you'd probably get in the high teens... what did you get with your previous car? Or did you not measure it?

Acceleration is by far the biggest killer of mileage. A short commute, or frequent start/stops (stop signs, lights, and traffic), makes fuel economy plummet. This is true for all cars, though of course hybrids are famously a bit more tolerant of this. But you can't actually get "good" mileage in this situation unless you buy the lightest car you can find. The TCH is pretty heavy.