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Get a G-tech and test it yourself.
Done it in the Cooper S and got a reading of 6.72 secs to 60 on the factory 17"s. Did the same on a CTR and got a reading of 6.4 secs.
A lot of the magazine tests are carried out when the cars are not run in.
Also you get accustomed how to launch your own car to its full potential. i.e on the Cooper S it is best to be launched from about 4000 revs to get the best 0-60 time. I am sure the 6.6 secs on the 172 can be done.