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In addition to the official figure, which is measured over the EPA test, any Tesla owner can tell you what their actual average is. Mine's 305 over 27k miles.

Tesla claims [1] that the 85kWh pack will get 270 miles of range on the 85D (265mi on the 85).

85kWh/270mi = 315Wh/mi.

[1] http://www.teslamotors.com/models

That's pretty in-line with real-world usage. I think my lifetime usage is 311 Wh/mi over ~16k miles.

The actual replacement cost of a new 85 kWh battery is $25k, over twice as much as the blog uses to justify its conclusions.

http://www.teslamotorsclub.com/showthread.php/45988-Model-S-...

I couldn't find the original source for the $12k claim, but some articles mention this is the price after 8 years. They had a deal where you prepay $12k now and get your battery in 8 years, which sounds too similar to be a different deal and can't be used to support a $/kWh claim.

I tend to average around 400 Wh/mi.