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For the second test of the CGT (7:28) Porsche did in fact rent out the track because WR said he wouldn't drive that car like that again in traffic. The GT2 is not 6 seconds faster than the CGT, so that's how I know they positively would not run a 7:22.
Still no proof that Porsche closed the track for the CGT's 7:28. If Rohrl could set a lap at 7:29 while passing 11 cars in the GT2 during only a final shakedown run, it stands to reason that he would be faster on a full time attack run with a closed track. Do the same thing for the CGT and it's not going to be 6 seconds slower than the GT2. The fact that Marc Basseng knocked off a 7:28 in only a handful of laps in blustery/windy conditions should tell you a 7:28 is not the CGT's ultimate pace. You're not going to find the absolute best out of a car like the CGT in only a handful of laps, despite what monaro says.
You're so big on erroneously extrapolating HRing times to NRing times, go look at the CGT time vs the ZR1 times on the HRing and tell me a fully committed and experienced CGT driver could absolutely NOT pull of a time similar to what Magnussen says he can do EASILY in the ZR1.