On a tank fill up(2nd) I went 341 miles on 9.7 gals for 35.2 MPG in an approximate mix of highway(70%)/city(10%)/suburban(20%). No attempts at getting best mileage possible and tires inflated at factory spec 32 PSI. Highway driving was on cruise control at 70 miles per hour with air conditioning on in non-ECO mode whole time. The MPG was in line with what I expected when I bought the car. My old car got 22 MPG on premium and now I get 35 MPG on regular, so I'm happy.

P.S.> the computer estimated I was getting 36.3 on this tank of gas, so it overestimated a bit. Of course, every fill up isn't the same. Some times the gas jockey(this is NJ so they run the pumps, not you) puts in almost another 1/4 to 1/3 of a gal to make the price come out even. So the computer may not be off as much as it seems.