We're all throwing out a lot of extremes for direct comparison on this thread, and trying to justify minor differences with empirical lab data that may or may not relate to the reality of the road. I will say the fastest tires I've lived with 320 tpi, 95 psi, 27mm (probably 26). But not until they warm up (also demonstrated trying to chase the tandem, which is a steady 2 mph faster than I normally ride). The good news is, there are many great tires out there for our personal preferences of longevity, cozy, and fast.
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