Where is your evidence? Chris Harris on Jalopnik no doubt. Yep, that's definitive proof for sure
I never questioned the legitimacy of the Corsa tyres on the Mclaren. You however were questioning the tyres fitted to the 458 earlier which are also customer spec'able items. Like for like spec choices by both manufacturers in that regard for the test. Why put a car out on rubber you know to be slower if the whole point of the exercise is to set the fastest time.... it's not rocket science.