Mileage can also change greatly if you're doing city riding vs highway riding due to frequent stops and starts. I doubt your bike measures the fuel consumption based on whether your on the highway or not. Also depends on how hard you accelerate...
Based on this site:
http://www.fuelly.com/motorcycle/kawasaki/er-6n , on average for the 2012 er6n is around 47mpg which converted is about 20km/l. On average according to this, you should be running at around 5L/100km.
P.S. Hey! I see you on that list with a N/A rating