Again, they're not losing $4000 per car in the sense that their cost to produce one car is $4000 more than what they're selling for. (Meaning if they sold 50k more cars, they'd lose $200M)
They had significant CapEx and so their revenues - costs worked out to an amount that was $4000 for every car they did sell. Had they sold more, their net loss would have been less, not more.
Yeah, for whatever reason that headline stuck even on sites that are typically less click-baity and/or pro-Tesla. My favorite way I saw the headline explained was something like:
I had major medical expenses this year and had to dip into my savings such that I ended up spending about 12k more than I brought in this year. I also ate 12 pizzas in the year. Their headline is like me saying "I lost $1k per pizza this year". It's accurate in a sense, but they're not related.
[1] http://www.cnbc.com/2015/08/10/tesla-burns-cash-loses-more-t... [2] http://www.bloomberg.com/news/articles/2015-08-05/tesla-fall...