nberry:
Grant, these test do not related to us in any way. None of us can get to maximum capability driving these cars. So the question is what is the car I am buying capable of? As far as I am concerned, magazine drivers do not provide us the information. Only the car manufacturers with their “official” times do.
I buy TV’s, smart phones and computers which I use to less than half of their capability but I still buy them. A car is no different. With all these products I rely on the manufacturers(not magazines)to tell me what they are capable of. 
The problem is that each manufacturer will do the ring lap in their own way, if you know what I mean, and a lap time is not an empirical reproducible value, so the can claim what ever they like that they cannot be help accountable for false advertising or somthing like that, like they would if they would exagerate horsepower or milage. So you cannot trust manufacturer claims in regards to ring times, and we have seen many tricks they have used to polish their times.
Magazine tests like SA are more useful because they use the same methodology for all the cars so the test has less variables distorting the result. And while the times the SA drivers can achieve will not match the factory drivers, that is irrelevant, for the lap times only have value in relation to the other cars and not in absolute terms. So what is of value is not the absolute lap time, that tells you nothing about the car if you cant compare that value, what is important is that the lap time is comparable to other car's lap times, and its the difference in lap time that gives you any information. And magazine tests are much more comparable to tests of the same magazine that manufacturer claims with each other.
Even then, you cannot blindly trust magazine tests, its an estimate taken with a grain of salt, but still much better than manufacturer claims.
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⇒ Carlos - Porsche 991 Carrera GTS