Lexus ES 250 F Sport - How many km/liter of petrol can this 2.5 liter engine do? YS Khong Driving

How many kilometers can a 2.5 liter Lexus ES 250 F Sport get from one liter of fuel?
This engine is supposedly one of the most thermal efficient engines, and the mooted fuel consumption is 6.6 liters per 100km, or 15.15 km/liter.

The above figure is actually very good from a 2.5 liter engine, so we set out to check it out, at the same time going to Seremban for a bowl of delicious beef noodles.
We did a 50 kilometer run, mostly on the NSE, starting from the Sprint Highway in Petaling Jaya, and to we have not edited the video in any way, to show the authenticity of the run, so you may hear some unintended speech in the video, LOL.

So what do you think? Do you think we could match the 15.15 km/liter or did we do better, or perhaps worse?

Please watch the video, and do not skip any of the sections, and let us keep you engaged throughout the 35 minutes we took to go the distance.