Done it.

A couple of my favorite training routes include north/south climbs/descents. Our prevailing spring winds often switch from mostly from the south to occasionally strong from the north. Perfect for weird Strava times, especially since I'm a mediocre climber under neutral conditions.

So recently on several occasions I've coasted down a long grade at around 12-14 mph (which I usually ride at 25-30 mph) into the wind to conserve energy for the return trip. And back up at 16-19 mph with the tailwind assist. This appeals to my sense of absurdity.

On the flip side, some of my return trip climbs into the wind have slogged along at 8 mph. Not sure the 30-35 mph downhill rides with tailwind were worth it. Okay, yeah, they were.