
Wah liao.. 10KML normal meh?? Suey lor... my Toyota Corolla getting better at around around 14-15KML, same style of driving...

If you are using the stock rims, I would say the FC is quite bad. However it all very much depends on your city/highway drive. For many short stops, the speed doesn't even go higher than 60km/hr, hence doesn't even engage into the 4th gear.
In my case, if I have lots of short stops eg during school terms when sending my kid to school, I would have 80% city / 20% highway. My FC is about 11.5 km/litre. Now school holiday, my trip pattern is 50% city / 50% highway, FC is 12.5 km/litre. For long distant trip from west to east, 20% city / 80% highway, 14 km/litre. All the above with 16" rims.
True enough, toyota altis also have better FC. My colleage travels daily from Bedok to Jurong achieved 16 km/litre, on stock condition, 14" rims.