Getting a new HCHII 10 days ago with a build date of 2/06 isnt possible in Houston. Are you sure you are the first true owner? ( Sorry to suggest this).
IF so, I feel that with almost no alretation of driving technique, anyone can score about 34-35 on the first tank. This coming from a Volvo driver still on his first tank.
1. Does the auto stop work?
2. Do you coast to a stop when you can?
3. Do you avoid accelrations from stops that increase the speedometer more than 2
MPH at a time?
4. I find the cruise control to be much more efficient than my foot. Are you watching the instantaneous MPG gauge? That thing is key. Do you see the IMA working on the electric side using the white/green assist/charge indicators?
The cruise control can engage at 25
MPH I have found. VERY SMART! Also, if you know any other expreienced drivers of the car in your area have them drive the car and they will be able to tell you instantly if its all good or not.