Jalan-jalan around home town with family members on board, with the same fuel tank travel back to KL using back road but stopped halfway to refuel. Around 140 km back road, 150 km town drive.
Distance traveled = 293.2 km
Fuel spent = RM 33 = 14.3 liter
Average = 20.4 km/liter I can say I'm pretty impressed and happy with the advertised fuel consumption figure that is easily achieved with moderate effort.

Few notes for those who are interested on driving experience.
1) Drove on highway around 120km/h and the car feels stable, much better feel than a floaty Myvi. The engine felt very smooth, no sign as if the engine is stressed, and wind noise is minimal, so is the 3-potter. RPM is around 3,200 rpm IIRC.
2) The recommended tyre pressure is 250 kPa, but on those LRR Hankook Kinergy EX tyres, it doesn't feel rock hard, it absorbs bumps rather nicely.