RC:
Right, I forgot about what a Porsche guy told me a couple of months ago (I think I posted it here...).
Well, another possibility would also be that your GT3 RS is just too new. The engine needs a couple of thousands of km to run in, so does the drivetrain, etc.. The weight difference to Porker's car shouldn't really play a huge role in the 180-255 kph speed range.
I wouldn't put too much thought into this (yet).
Yes, I am also sure my car will run faster in a few thousand km . I have now barley 2000 .
I am not worried . It was more of an observation, even if surprising . To me it shows again that all test numbers on paper should be taken with a distance compared to what happens in real life .
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997.2 C2 , -20mm I 964 Carrera 4 I 991 GT3 RS