Driver72,
I understand what you are saying but when you actually view the tests that have been done, all the slow ones with the one exception have been on Bridgestone rubber. In fact it was commented by one of the magazine (can't recall which) that the second GTR tested was a full 5mph slower and that one was on Bridgestones instead of the Dunlops and they found excessive wheel spin in comparison to the Dunlops.
There may be more to this than first meets the eye, especially as the GTRs incredible times are believed to be the work of it's launch control.
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