CR also does cross validation on these surveys on multiple levels. They don't reveal their exact validation techniques for obvious reasons but they do say, contrary to what a few have said upthread, that the more likely scenario is that the car manufacturer would attempt to "stuff the ballot box" with positive responses from their employees. Also, if I recall correctly a huge percentage of the respondents (95%?) said Tesla service was great and that they would buy another one. Not something you would say if you were trying to destroy Tesla. Re the post truth, conspiracy theorists all you can do is call them out to prove it or just ignore everything they say and hope others will do the same.