me too, not a silent reader for long . . . but silent anyway.
I've cuore 2007 cx eco. averages 12km/ltr on petrol non ac, hardly use 1 tank cng a month.
cuore, as i have come to realize in 6 years, that cuore has a good pick and great drive masha Allah, but at the cost of fuel average. Plus, I was reading in another post, starting from somewhere in earlier part of the first decade people claiming average of 22, then it slowly started coming down to 13 to 15 is good enough.
Probably, older the car gets the lower the average. plus putting an efi to improve the average is a risk that only experts can tell, is or is not worth taking.