From the link: "At 80 psi, rolling resistance is 22.0 watts, which means rolling resistance is 8.3 watts higher when compared to a GP4000S II at 80 psi (13.7 watts)"

Can anyone explain to me what that means in real world terms? For example, in my regular 14 mile one way commute to work, how much faster will I be on GP4000s than on Gatorskins?