It would be very convenient if during the brew session if the "Brew Steps" asked the user for volume, gravity, temperature readings at appropriate times for the "Brew Log" efficiency calculations. For example in the Boil section of the Brew Steps the check mark "Expected pre boil volume of ..." the next step would be a text input for the user to log actual preboil volume collected (and temperature for temp corrections). This would automatically be applied to the efficiency calculators in the Brew Log tab.