I have Toyota Altis 1.8 its fuel average is 10.5km/l. I thought I was getting low mileage but after reading your post I am bit relaxed that my average is much better than a 1.3 car.
Just a suggestion; Make sure you get good quality fuel (petrol). Usually, I have noticed that PSO & Shell have the poor quality fuels while Total is better option. Also, change Engine Oil & Oil Filter and Air Filters on schedule. Read owners manual for instructions.
The reason I prefer Total fuel is that I had Honda Civic back in 2007. That car was doing low with the initial pick. Honda dealer recommended to change the fuel source. So, I switch to Total, after that my Civic gained good pick.