As many would suggest to you, the milleage you get is still perfectly OK. But despair not, you came to the right place.

If you spend some time reading though the relevant threads in this forum you'll no doubt gather some valuable tips that will enable you to get great milleage and have lots of fun at the same time.

May I recommend the following excellent article as a good point to start getting the most out of your 2006 Civic Hybrid:

Adapting Basic Hypermiling Techniques to the HCH-II

Regards, and welcome.

MSantos