G Fazal Bhai , its mentioned that's what the forums above are explaining. Claims are much different than real world for some reason, may be Honda knows. Specs mentioned are 20.2 for Accord but still see the above forums. Those are people living and driving in US.
Its theory vs Actual to be precise. You can see both Accord and Civic figures from different drivers who tested by Ktuner. Basically ktuner 0+ gets 16 on stock map, safe and FUN, ofcourse fuel dependancy would remain