Most competitive Everesting attempts use a steep and typically short road. 3-5 miles of downhill on a 5-6% gradient is probably too time consuming (i.e. too much time spent not ascending).
Ronan McLaughlin, the current mens' Everesting record holder, used a 12%, 800m long segment:
IIRC from a video I saw about it the prevailing wind is up the valley, so he got a bit of a tailwind on the ups but the headwind on a 12% descent didn't matter.
Ronan McLaughlin, the current mens' Everesting record holder, used a 12%, 800m long segment:
https://www.strava.com/segments/876936
IIRC from a video I saw about it the prevailing wind is up the valley, so he got a bit of a tailwind on the ups but the headwind on a 12% descent didn't matter.
https://cyclingtips.com/2021/03/ronan-mc-laughlin-has-smashe...