fickle,
That is awesome mileage that puts Toyota Vios and Honda Jazz owners to great shame.

Can you share with us -
1. What brand engine oil you use?
2. Synthetic or mineral?
3. 10W40?
4. Tyre pressure?
5. Petrol brand and octane?
6. % highway/city driving?
7. No. of people usually in your car?
8. Do you usually drive without your air con?