Welcome to the Hybrid club! Have you read the following information about improving your MPG:
The link is to Tarabell's excellent and extensive article about adapting hypermiling techniques to the HCHII, from CleanMPG.com:
www.cleanmpg.com/forums/showthread.php?t=1306
Also, Steve (AKA "Hot_Georgia_2004") has written an article you can read on the "Learn" section of this site.
I have read and re-read these articles, and all the info I can about maximizing fuel efficiency, and think I am slowly getting it! Yesterday, on a 112-mile round trip, I got 58.2 mpg. I've only had the car 3 weeks and don't yet have 600 miles on it. I am getting in the 46-47 mpg range on my daily commute (in town, but not lots of stop and go traffic).
And I smile too when the engine shuts off! I love this car more every time I drive it.