I'm sorry for reviving this thread, but it would feel rude not to reply with all the helpful comments posted so far.
"How many kilometers has this car done so far?"
Around 80,000 on the odometer. You'd better believe it has done more than that.
As for air-conditioning, we've started turning it on a lot recently due to the Lahori heat. It's on whenever we leave the house, but we dial it back to '1' after it's been on '3' for about 15 minutes.
"Change spark plugs if you haven't yet
Clean the throttle body
Change fuel filter/air filter
Clean the fuel injectors
Get the wiring checked for any leak or sparks at joints. That can put load on alternator and increase fuel consumption"
We've done all of that apart from the wiring part. Had the remaining done yesterday, so I'll report back on the economy. We're actually very passive drivers; gentle on the accelerator at all times, which made the calculated mileage all the more surprising.