Jeromeee, How long is your avg drive?
I found that, more than anything, short drives, 10 minutes or less, will make your FE suck bad. I have a 40 minute commute, and I average about 32mpg (40 - 50 MPH, few stop lights).
For the first 15 minutes of my commute, my MPG goes steadily down. After that, it starts to climb right up to the end of my drive. I believe if my commute were longer, I'd get even better FE.

On the weekends, when I use the car for 5 minute trips near the house, again my MPG goes down. (it's depressing).

BTW, I have about 1100 miles on the car.

-Jw