Another question, how to apply this tweak? I get error message:
tee /sys/devices/platform/soc/3f980000.usb/buspower: permission denied

https://soundcheck-audio.blogspot.com/2018/10/rpi-3b-on-air.html#more

The Killer Tweak

4. Turn off the entire USB stack on 3B+ (saves about 200mA!).

echo 0 | tee /sys/devices/platform/soc/3f980000.usb/buspower
>/dev/null

Tweak nr 2, WLAN power managment turns on after reboot:

2. Turn off WLAN power management

iwconfig wlan0 power off


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