A factor not addressed here is weather conditions, especially heater use , which always affected my mpg with my Prius. On cold days with short drives, it was not unusual for me to get 27-29 mpg over most of the winter months. In spring without AC and on longer routes at 55mph I could be close to 47. However, averaging those conditions over a few months, I got used to less than thrilling mpgs. I was ok with this. Loved the Prius but was ready for a CMax with great options and a new style. The mileage I'm getting now is low 30's under similar driving conditions and heater use nearly every day lately. Because of a larger gas tank, I can get more miles before refilling.