Real World Leaf Range 27 - 38 miles
http://www.plugincars.com/real-world-leaf-range-27-38-miles.html
Man, is that useless.
If you actually read your link, you will see that it is just an anonymous forum-poster using some funny math to arrive at those numbers. That would be like me linking to one of my own comments and saying, “Look, here's a source!”