I have an 01 Rio 5spd ...
when I first got it I was getting about 10l/100km
when I changed my shifting habits and eased up on the gas pedal I'm getting 7l/100km most of the time and even less when I'm doing mostly hwy driving. I do use mostly ethanol blended premium gasoline...however, the mileage hasn't changed when I've gone with the cheap stuff (ethanol blended isn't available anywhere in the northwest USA....at least that I've found)
Check the owners manual, they list two sets of shift points. One for regular driving (which is what I used and got 9-10l/100km) and another for "fuel economy". Using the second set, and a light foot made all the difference.
Of course, if there is a mechanical problem....well, the lightest foot won't help you at all then
