You may just have a lemon car. You may have to start inquiring with the Honda corporation via complaints if you can't get anywhere with the dealer. Usually, the dealer will try to prolong having to go through the trouble of diagnosing the vehicle as a lemon.

I get about 30-31 mpg here on Long Island during 30-40 degree weather with driving only 3 mi each way for my commute. Basically I'm only using the engine since in this weather the engine can't warm up completely during that short a commute for the IMA and Auto Stop to kick in. In 20 degree weather while driving on the highway between 65 and 70 mph I can get 40 to 45 mpg.