A little more about the CARWINGS system
http://www.nissan-global.com/EN/NEWS/2010/_STORY/101101-03-e.html
http://www.nissan-global.com/EN/NEWS/2010/_STORY/101101-03-e.html
"Ranking" function: Nissan LEAF owners worldwide can compete with each other in electricity consumption, traveling distance and the amount of charge produced by regenerative braking.