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At 20 mph, going from Crr of 0.003 to 0.006 would cost me 25 watts total on steel drums.
But, we do not ride on steel drums. A GP5000 on very good roads would be around 0.004 and a gravel tire would be more like 0.008 for a power differential of closer to 35 watts or a drop in speed by 1.5mph at the same power. At 12 mph, the speed difference is closer to 2 mph.
I am always amazed how many riders claim these differences are not noticeable or that they are not significant when in fact, there isn't much freer and easier speed than in tires.
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