How much power does a laptop use?

Laptop companies report the capacity of their laptop batteries, and also like advertising that their laptops have however many hours of battery life. It's easy to derive their (advertised) power usage by combining these two numbers. As examples to study, I picked three laptops that Wirecutter recommended, as well as what seems like a well-regarded high-end gaming laptop. The MacBook Air (13-inch, M5) advertises 18 hours video streaming and 15 hours wireless web on a 53.8 Wh battery, which implies power draw of 3.0 W and 3.6 W respectively. The HP OmniBook X Flip 14 inch 2-in-1 (pdf) advertises 16 hours 30 minutes on a MobileMark 25 benchmark and 22 hours 45 minutes playing a video on a 59 Wh battery, which implies 3.6 W and 2.6 W, respectively. The Lenovo Yoga 7i 2-in-1 (14" Intel) advertises 31 hours of video playback on a 70 Wh battery, which implies 2.2 W. The Razer Blade 14 advertises "up to 11 hours" on a 72 Wh battery, which implies 6.5 W. Of course, the laptop companies are…