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Mesh range

Hi, 

I would like to know if there is any reason that tx_power is limited to +4dBm in the Mesh examples. I am using an nrf52840 and it is capable of +8dBm.
Would it increase the range in mesh networks ? How much ? 

I have seen in this thread (https://devzone.nordicsemi.com/f/nordic-q-a/29813/change-phy-in-mesh/118379#118379) that it is possible to change the phy to coded so I have the same question:
Would it increase the range in mesh networks ? How much ?