Note: I read this post, but it didn't answer my question Which Personal Hotspot mode uses least battery?
I often use my iPhone as Personal Hotspot for my MacBook Pro. I found the linked question above on this site, but the answer to this post only says "USB tethering will use the least battery (...) Bluetooth should be next (...) with WiFi last." without any source to confirm if this is true. After Googling for almost an hour, I find conflicting informations, some claiming that WiFi uses less while others claim that Bluetooth uses less
This same question links itself to another post WiFi or Bluetooth (or USB) for iPad Tethering but also here, for power usage the answerer says "Wifi and Bluetooth are less power efficient than USB but I don't know how they compare". WiFi seems to have a greater internet speed than bluetooth, but that doesn't necessarily mean it uses less battery
I really hoped that this site could have a clear answer on this, but as said above the only answers I found don't say clearly if WiFi or Bluetooth uses less battery. Do you maybe know more about it ? Thank you so much for your time