Last year when I brewed an imperial stout my efficiency dropped to 53%. I'm about to brew the same beer and I was wondering if there was a way to predict this change in efficiency?
I am crushing my own grain this time and get around 72% with a 1.063 gravity beer. If I'm shooting for 1.100 is there a formula I can use to estimate the lower gravity?
I am making this with first runnings if that makes any difference.
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