What efficiencies can I expect from the G70? This depends a lot on your grain bill, grain crush and recipe. Our overall testing has yielded efficiencies between of 70-85%. Related articles Is the G70 Micro pipework the same as the G30 Micro Pipework? Calculation - Mash and Sparge Water Volume Technical Specifications - G70 Video - Quick Overview of the G70 Minimum and Maximum Grain Bills What efficiencies can I expect from the G40?