What the article is explaining can be summarized in this chart: http://i.imgur.com/mNcGdfS.png

But I think this is incorrect:

> In nearly every case, the Tesla gets about 20% fewer miles out of each charge than it estimated.

Musk and Broder 'agree' that the vehicle's actual range was greater than it estimated. Musk's wrote,

> Then he bizarrely states that the screen showed “Est. remaining range: 32 miles” and the car traveled “51 miles," contradicting his own statement... The car actually did an admirable job exceeding its projected range.

As an aside, please disable Tynt on your blog.