not sure what you expected for basically "city" mileage, but what your getting is close to what the EPA rating is for city driving, I'd say your doing pretty well.Just calculated fill up #2 since working. Boy oh boy, 18.9 MPG. This is definitely going to be a fun few months, as I really hope gas prices can actually drop down below $3/gal.
At least your not putting 40 gallons of diesel in a truck when your towing and getting 12mpg or so. Made three 450 mile round trips this last month towing a trailer to go motorcycle riding/racing Haven't hit $200 for a fillup yet, but have topped $175 once.
Hint: Get a PenFed gas card with a direct deposit to a PenFed account. you get 5% credit on your gas purchases for the month with the credit applied before the bill is sent out. Must swipe at the pump for the 5% cash credit. And there is no monthly or annual limit on fuel purchases unlike many cash back cards. Combined with a Kroger fuel credit it's good for $.25-$1.00 discount per gallon.
And with Kroger you can get 4x fuel point on "gift cards" so for places we often shop we buy gift cards and use them. A $100 home depot card gets me $.40 off 35 gallons of fuel.