When using simple sugars (e.g. Cane sugar) in your fermentables, there is a mismatch between the ending kettle efficiency defined in your recipe vs. a perfectly executed brew session. The calculated ending kettle efficiency in the brew session will be much lower than what you put into the recipe, even if your OG is spot on. I believe I found the reason but it's very confusing. The brew feature removes the expected contribution from the raw sugars from the actually measured ending kettle gravity before doing the efficiency calculation. This way, the efficiency figures pre and post boil can be compared. The recipe ending kettle efficiency just adds all the fermentables together and applies the efficiency figure to that. Hence, if you're recipe contains a lot of cane sugar, you will also need to set a higher ending kettle efficiency than you normally would, to correct for the fact that cane sugar is actually 100% efficient. This is undesirable IMO, because the efficiency should be a characteristic of the setup, not recipe, as much as possible (I know efficiency will drop for very high gravity brews but that's an entirely different story). It also means I cannot correct my recipes with the results from the brew session, because the definitions are different! An option would be to add a checkbox or third option when choosing between brewhouse efficiency and ending kettle efficiency in the recipe editor? A checkbox like "exclude raw sugars from efficiency"?