Just an update . . . if I reset my computer before I leave for work (10 miles city, 40 miles highway) I have since gotten to 32.4mpg for about 3 miles .
At the end of the weekend (Fri, Sat, and Sun) after all city driving, I was "down" in the 28s.
My own calculations show that my average is about 29.89 total since buying the car in February.