That sounds like about the kind of mileage I would expect from a car that makes lots and lots of short trips on a cold engine. And if I am to understand that you have gone only 120 miles in 10 days then maybe that's not far from the truth? There are things that you can do beyond driving "conservatively" that might help out. I'm not talking about anything fancy, just doing the best you can to make the most of your driving environment. For example, the best way to drive hills is to pick up a little speed on the way down and then let the car slow down a little on the way up. If you have to deal with a lot of stop lights, do your best to time them so that you can carry momentum through at least some of them. Then there are other tricks that apply specifically to hybrids that I don't know too much about, personally. (Most of that has to do with managing the battery state of charge and maximizing the extra goodies that come with the package.)

For now I'd say just keep on driving and see what happens. It ought to do better by itself as it breaks in and you adjust to it.

Enjoy your new car!