Mileage will get much better after 10,000 kms. But if you're doing Makati at rush hour, I doubt you'll go over 7 km/l, considering it's a 1.6 AT with a big body.
There are some minor tricks you can use to tweak it a bit... a grounding kit supposedly helps with throttle and transmission response... inflate your tires more (30-32 psi should give you better mileage) and adopt a more anticipatory style of driving... hang back a little more, let off the gas earlier (coast to stops when you can) and try not to be aggressive on the gas and brakes (I know, I know... impossible in Makati)
Buck up. The old Familia could get 6 km/l... on the highway...

...6 km/l in traffic in a much heavier car isn't that bad.