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of interest:

Specialized Rockster Pro at 43.6 watts - ouch!

also the Conti Explorer Supersonic at 31.3 watts is rather slow rolling. remember the Nokian NBX Lite 2.0" ? it had around 18 watts....

they also tested inner tubes all on the same tire at the same pressure. they also tested the pinchflatresistance - the higher the better:

make: weight / rollingresistance / pinchflatresistance

Schwalbe XX-Light: 99g / 22.9 watts / 60 cm

Conti MTB Supersonic: 93g / 22.3 watts / 60

Michelin C4 Latex: 122g / 21.3 watts / 60

Panaracer GreenLite: 104g / 21,2 watts / 50

Maxxis Flyweight: 94g / 22.6 watts / 55

Schwalbe Extra Light: 99g / 23.7 watts / 60

Kenda Downhilltube: 675g / 29.2 watts / 80

Maxxis Welter Weight: 182g / 23.9 watts / 60

Maxxis Downhill 1.2: 296g / 24.9 watts / 80

inner tubes filled with sealant:

Zzyzx Safe Ride: 299g / 24.3 watts / 60

Kenda Pannenschutzschlauch: 286g / 24.9 watts / 60

once more the Eclipse-Tubelesskit proved to offer less rollingresistance compared to the fastest of the inner tubes, the Michelin Latex. at 20.4 watts that's 2.2 watts per wheel less!