I run all my vehicles at the max cold pressure molded on the sidewall.
I assume yours are Dunlops as well, and mine are rated at 51PSI Cold pressure.

About the EPA rating:
With CC locked in at 60MPH I get 45-47MPG.

I'd give your new car a few weeks, I'm sure it will improve.

Efficient drivers do it better.
1003 miles a tank personal record. 74MPG calculated. HCH1 CVT