It's really not power, it's just debugging and optimizing rates and retries. Lots of wifi has lots of dumb bugs that no one ever figures out, because stuff still mostly works, with all the built-in retries.
(I used to work for an enterprise WiFi AP vendor, debugged some driver bits myself ... back when 802.11n was brand new, all the enterprise vendors were increasing their effective throughput from 80mbps, to 100mbps, to 140mbps, etc, just by debugging and optimizing their drivers.)
(I used to work for an enterprise WiFi AP vendor, debugged some driver bits myself ... back when 802.11n was brand new, all the enterprise vendors were increasing their effective throughput from 80mbps, to 100mbps, to 140mbps, etc, just by debugging and optimizing their drivers.)