A lot of stuff has been going on regarding the mileage of this car, here is a little something which I felt during a recent trip in it.
Usually, on an even road, or moving downhill, cruise control is a healthy option to maintain speed. Otherwise this car will gain speeds very well above the speed limits and won't even let you feel the slightest of anything if you don't look at the digits on the dash.
BUT, it really screws up your gas mileage if you use it uphill. It floors the car HARD to maintain speed, that's what I've felt. The normal economy of 14-15kpl dropped down to hardly 9 kpl when driven with cruise control uphill. Turn the cruise off and accelerate softly, the mileage will still remain in 13-14 kpl numbers.
I consider what it does for an 1.8L car pretty decent, provided my 1.3L Corolla GLi drinks a liter every 9 or 10 kilometers.