I just took a trip Penang to KL and back last weekend. FC on 100% highway I achieved 12.5km/l speed at 110-120km/h. this includes climbing up hill to the Terowong before Ipoh.... might be higher km/l without the hill climb.
Mixed driving KL traffic and highway 30:70 ratio, I achieved 10.5km/l.
I am still getting around 13+ km/litre average (H'way / City).
I have achieved > 17 km/l (H'way only).
If you guys want to get the same mileage, you will have to change your driving style.
Pay attention to the display on dashboard on the mileage you are getting every time you floor the pedal.
Remember at what speed & rpm is giving you the most mileage and try to stick to that speed.
(I get the best mileage @ 80+km/hr @ 1400 rpm).
It is impossible to get good mileage if you are always in a hurry.
I guess I am used to driving very frugal as I also own the current Civic Hybrid since year 2012.