worried about my carnival’s mileage

I’m getting about 33 mpg city and 30 mpg on highways. I travelled about 1600 miles already.

It’s a branch new Hybrid SXP. Is this a cause of concern? Some Redditors post close to 35-36 mpg. I’m not getting close to it. It’s always on eco mode but regenerative braking is not set to any level by default. Not sure how to turn it on by default to some level.

Is this something I need to worry about?