How much weight are people losing, on average, during long 5 - 6 hour rides in 80+ degree weather?

This summer, my average weight loss is 5 pounds on long rides exceeding 5 hours and that's with eating and drinking anywhere from 150 to 200 oz of water and electrolyte drinks. Is this normal?

After the ride, I feel thirsty, but not excessively so and after eating and drinking my weight comes back up.

What's normal for you?

Thanks for posting the link to the story.