What efficiencies can I expect from the G70? Nat September 20, 2021 12:02 Updated This depends a lot on your grain bill, grain crush and recipe. Our overall testing has yielded efficiencies between of 70-85%. Related articles What are the minimum and maximum grain bills that can be brewed with on the G70? Instructions - G70 All Grain Brewing System G70 Manual Operation Features Quick Start Guide - G70 What do I clean the Grainfather brewing and fermenting vessels?