FYI, fuelly tells me my average over 75 fills / ~36,000 miles is 42.8mpg. My best month is 47.4 and my worst month was last month 38.4. The car's at the dealer getting its mechatronics replaced (that doesn't sound like a real thing, does it...) so I've been driving for the last few months with only light electric assist. Instead of the electric motor taking me up to '2' on the 'tach' it kicks to gas at 0.5 or so... Even still I've been getting just under 40. I drive pretty fast and use my seat warmers and AC (I've seen no discernible impact from either on mileage). Fuel formulations for winter vs. summer make a much bigger impact on my mileage. I have a pretty ideal commute to work -- 22 miles of highway at 55-65mph and interstate at 70 mph. Some stop-and go but not much.