Maybe it will get a little better than the breakin period. I took it on a 500 mile round trip on the freeway and it was in the 13 range. Since then, I have hand calculated a couple of freeway trips at 15.5 and 16.5. However, that is purely freeway. I hand calculate it every time I fill up and with a mix or mostly around town, it is still in the 12-13 range. Like someone else said, the stop and go really kills it but I guess if you were to go on a trip, maybe you will get in that 15-17 range, which doesn't seem too bad.