I can't take this seriously. How is this proof? Tyres wear, age, harden, which is obviously going to contribute to the lack of grip. If you went out on the same day in the exact same car under the same track temperatures with 2 brand new sets of tyres, then that would be comparable. A mate of mine went from Toyo's to AO48's (which is what they use in historics btw) and consistently slowed by 2-3 seconds at Mallala. Im not saying that one of these tyres is better than the other but there's a lot of aspects that need to be considered when comparing tyres. Just cos you seen someone do faster times on one set than the other does not necessarily make those tyres better.
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