I don't like the mpg either. I consistently get 15-16 driving to/from work and around town, weekly. I've added taller tires (225/70s) so there has to be some consideration for the difference.
What I really don't like, and I manually shift the auto do to it, is the 1st to start off from a dead stop and turning. While in the turn, it'll shift into 2nd. There is no power in the lower bands of the rpm and I can't accelerate to the given 25-35 mph. Another disappointment is the acceleration up an on-ramp. I keep it in 2nd going 40-45mph then shift to 3rd to accelerate up to 65 or more mph to merge into traffic. I then hit the OD button to get it into OD.