Had he come back with a more measured response (like OXO did with Quirky) and just politely pointed out the inaccuracies of the article and made his same offer of "We'll provide a car to any journalist to do the same test and see what happens", I don't think we'd be discussing this right now.
It would be like if I complained about my new Android not making it past 3 hours of web browsing and then HTC slams me for running 15 background tasks and only charging the phone to 85% the night before. The point remains that these batteries are not the greatest.
Musk comes across as too defensive and a bit of a jerk. I understand he probably has PTSD after the other publication screwed him, but get over yourself. Most people just accept bad reviews and move on.
I didn't think the article was that big a deal. Now we have what is essentially a "blogfight" with both sides parsing out every little word that the other published.