What efficiencies can I expect from the G70? Nat January 23, 2023 10:38 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 Calculation - Mash and Sparge Water Volume Is the G70 Micro pipework the same as the G30 Micro Pipework? Video - Quick Overview of the G70 Minimum and Maximum Grain Bills What efficiencies can I expect from the G40? What are the minimum and maximum grain bills for the G30?