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Yes, but it only increases the energy (what Sean said, not power) as the square of the velocity. So 75/55 requires 1.86x as much energy per mile. That's the factor that most people care about, not instantaneous power.At these speeds, the aero drag is the primary (but not only) source of loss. Rolling resistance does not scale with speed, so your actual efficiency will drop by somewhat less than 1.86x. Maybe 1.75x if I had to make a WAG.
Yes, but it only increases the energy (what Sean said, not power) as the square of the velocity. So 75/55 requires 1.86x as much energy per mile. That's the factor that most people care about, not instantaneous power.
At these speeds, the aero drag is the primary (but not only) source of loss. Rolling resistance does not scale with speed, so your actual efficiency will drop by somewhat less than 1.86x. Maybe 1.75x if I had to make a WAG.