You should get something between 10 and 13 km/l. Anything below 10 is not acceptable doesn't matter if it's Auto or manual.
People think of a Civic, and drive it, as it were some super car- and then complain about low fuel average.
Obviously? How is that so obvious?
Silicon wires, Iridium plugs, HKS intake, 14.7 @ 140... good for you mate! Our friend here is asking about the later generation, distributor-less, D engines though.
Well, not to break your heart, but let me tell you that your Silicon wires, Iridium plugs and HKS thingy has nothing to do with the speed, acceleration or even economy for that matter.