There is an option to set "wifi coverage" as maximum, intermediate or minimum.

It doesn't explain in detail what this actually does or what to consider when setting it, only that maximum mode will use more power, but that sounds a bit lame as the device isn't exactly a massive power consumer and it's plugged in anyway so what does that matter.

I suppose my question is why would you not always set it as maximum. Surely you always want the best coverage ?

What does this setting actually do ?