Gravel Tires vs Road Tires?

With the cooler temps, and more rides in the dark, many of area riders have switched to gravel bikes and gravel tires deal with conditions. What is the impact on the speeds and effort levels of those tires. Well, back in June, GCN did a really good video comparing the two tires on the same bike…

https://youtu.be/TCrL7yHPMqo

Some really good information in there.