hmmmm..... their is something I don't quite understand
You mentioned 27km/l but as far as I have known consumption is usually measured in Miles-per-gallon (MPG USA / MPG Euro) OR Litres per 100km (l/100km). Any car brochure/website will have only these 2 denominations from my experience.
I am awaiting my Swiss MINI so can;t confirm if its computer has the kilometres-per-litre option but if it does I would be surprised.