So, before I read that post and I wasn't really paying attention on my average mileage and all, but I was getting about 10.5 l/km (I'm in Canada)
So, I took a trip to Pittsburgh and the mileage dropped down to 9.2 l/km ofcourse it's coz of the highway or freeway.
Then, I drove back and end up with 8.5 L/KM.
And now I have been driving in the city for over a month and a half my average mileage and present is 8.6 L/KM.
PS: I don't really know how these things work, but if this helps in anyway it'll be great.
I was just shifting at about 2.5rpm and when I was crusing I just put my car in Drive and set the cruse.
I hope I can continue to get this mileage.
Cheers