No they do not. They do not give out their totals and they ONLY survey those that subscribe to Consumer Reports.
They violate the first rule of any good survey, a open and random pool of samples. Any one that dives a car in the US should be in that pool, not just those that subscribe to CR. Let alone the sample size, they never release numbers, the average age/race/location/etc... of their pool, and on and on...
Well said.
For those that have actually done scientific surveys (which is probably not most here) a specific methodology needs to be followed for the results to be considered valid outside that population. The size of the survey group is important, but there is so much more at play. Size, demographic, bias(es) and response rates are all very key. For example, it is well-known that specific types or responses are received in survey-type polls. Generally, more 'passionate' or extreme response types appear in these vs. sampling a specific population for answers. That means in this case, you get a lot of more 'fanboys' and 'haters' responding, which can definitely skew responses.
It is probably not likely, and frankly too expensive, to do this 'right' and have groups of researchers sample different demographics all around the country, in-person, and get a large, representative sample population and compare to a control. That just will not happen.
All that said, I do believe CR does have some significant biases that have been identified in the past and ignoring that is rather ignorant IMHO. There is no practical way to get it 100% right, but at least the sample information should be released so we can draw our own conclusions. Failure to do so make me inclined to think there is a reason they are not doing so...