Even though the mileage depends on the driving habits and route. As per my reading this car should give avg around 9-10 km/l on regular fuel. In the USA tsx gives this average and the Euro in Australia. Guys report getting 600km in a tank within city driving.
I recently used injector cleaner and noticed a improvement in cars economy and acceleration. I will be replacing my fuel pump and fuel filter and also get injectors cleaned as a last resort to touch 10km/l.