Further, the fork stand reduces the wattage required by a full 1/3 when compared to two wheels being on the rollers. So, the resistance is next to nothing. According to the Wattage Chart at Kreitler's website, it only requires 210 watts to travel at 44MPH when using the 4.5" rollers combined with a fork stand.

In the real world, 210 watts would propel a person around 17-20mph on account of friction of the tires and more importantly, air resistance.