This is absolutely perfect average for Civic. Big engines consumes more fuel.
I used to drive same civic (2004 model) in Lahore and its average was hardly 8~8.5 KM/liter.
So I took a wise decision and shifted to smaller engine (1000CC Toyota Passo). Its very nice luxury and gives 14 KM/Liter within City with A/C. And at motorway, it gives 17~18 KM/Liter. Isn’t it amazing?