Nit picking but mash efficiency is a measure of conversion and diffusion, i.e. taking a gravity sample directly out of the mash and using the total water addition as the dilution figure. This is a measure of how much sugar you got into the mash wort.
Mash/Lauter takes into account how good you were at getting the sugar water out of the mash.
Brewhouse is the aggregate of all the processes and considers system losses post boil.
That's why I said there are three different places you can test for efficiency where the figures are going to be different.
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