SamLegacy

I recently purchased a 2015 Subaru Legacy with 7,000 miles and driven by a sales manager at the dealership. I have driven the car about 2,800 miles (about 1/2 highway and 1/2 local) and am not getting anywhere near the stated mileage. My commute for work is about 2 miles each way and is not stop and go (I go about 25 to 45 miles per hour on a main road). Highway, I keep it between 65 and 72 mph. My city MPG is about 18 to 22 and my highway is between 25 and 28. Advertised mileage is 26 mpg city and 36 highway. I'm just not getting anywhere close to this. Has anyone else experienced these issues? I have the car currently into the dealership, but they don't seem too interested in looking for any problems since there is no check engine light on.