Interesting test. Sad that they used both latex and butyl tubes, but never quantified the difference between them!
Also not cool that they declared Specialized the winner, but failed to test the Supersonic, GP TT, Attack, and Force which are all faster than the GP4000.
Yeah, I agree with the latex, butyl comment! It actually looks like the Turbo Pro is very close to performance to the S Works if you factor in the lower rolling resistance of the latex tube... I would like to know how close! One thing I don't like is that this is with a weight of 50kg... I guess it's useful if you're a woman/junior but I'd like to see it with a more reasonable 65-75 kg.
Forgive me if I missed the obvious, but are the figures in the tabular rankings the actual wattage measured or are they doubling it under the assumption that you would be using 2 of the tires? I ask that because the numbers look kind of high compared to the data from Al Morrison, Tour Mag, etc... This would also account for why they only used 50kg, because they are figuring that each wheel will only have about 1/2 of the bike/rider total mass, which would mean that they actually went kind of too heavy, rather than too light, if they were shooting for a realistic load (apologies to the Clydesdales out there).
They mention measuring 2 samples for each model and averaging them, but don't mention doubling anywhere that I could see.
There are also some *s for the Weight, Watts, and Conti listings, however I didn't see a key that would explain what they mean. They address the Conti TPI issue in the body text, but not the Weight or Watts, but I could imagine that would be where they would say that they doubled the measures.
Regarding Latex vs. Butyl it is weird that they didn't quantify the difference. Other sources indicate it depends on the tubes in question but that 3 watts per tire is reasonable to expect, which would bump the Turbo Pro from 16th to 6th for a pair.