Originally Posted by
dmanthree
And riding the way you did, likely at lower speeds, actually reduced those difference. The lower the speed, the lower the RR.
Lower speeds mean less power consumed from rolling resistance, but that's true about nearly all sources of resistance to a moving vehicle. As a proportion of total resistance, rolling resistance actually tends to be higher at low speeds, except if those low speeds are due to climbing (where gravitational resistance becomes dominant).
On flat ground, the proportional increase in speed from switching to a faster tire is actually
higher for a slow rider than a fast rider.