The only thing I would say is that it annoys me that they just say that the GTR is quicker on it's more track orientated tyres, but rather than getting a car thus equipped (like the Porsche is), they just acknowledge this, but still run the slower tyres .

If they REALLY want to settle the arguement once and for all (as Porsche claim the car MUST be tampered with, where Nissan claim that Porsche should just learn how to drive a GTR ), they should put the CORRECT tyres on one, get the Porsche driver to see what he can do with it on a lap, and then get the Nissan test driver to do a lap. If there is no significant disparity between the times (and it doesn't get down to near the quoted Nissan figures), then the time has been fudged. If the Nissan test driver can get to within 5-6s of the original time (as Chris Harris mentioned, the track times can vary from month to month), then you know it is sour grapes from Porsche - job jobbed .