Have you tested the crr of the compass tires vs continentals or just going by feel? Based on the roller testing data from Tom Anheult (
Blather 'bout Bikes) you are probably giving up around 15 watts to a pair of GP4000. I'm wondering if there is any data to support the 'fast rolling' claims of the compass or whether people are simply biased and regurgitating the company's claims.