I have a vitz 2006/ (2012 import)
Let me put it this way, On Highway, each Fuel point drops between 90-110(b/w lhr-isb). The round trip of LHR-ISB Costs me 1 Tank. The milage might be better if I didn't have to spend a lot of extra fuel on Salt Range.So, on average, 740km/40Ltr with AC. That makes an avg of 18.5. But on straight road, First point drops at 110. Since there are 8 points, each of 5 Liters, so avg becomes 22.
In city, I normally get 16-17km with AC.
The Trick is in your foot. If you drive it with RPM at 2 max, and let it shift to higher gears sooner, it will give you amazing milage. But if you are going to push the throttle hard, it will prove to be a hard and expensive car for your pocket.
i am sure you got the idea.