Should I expect lower efficiency when I'm using adjuncts?
This is the second brew where I've come out significantly lower. Today I used 4 lbs. of 2-row and 2.75 lbs of instant rice.
I came out about 15 pts lower than I expected. About 50% efficiency rather than the 75% I usually get.
A month or so ago, I used Munich as my base in a stout I've brewed many times. I came out at least 10 pts low. I blamed it at the time on the Munich, as I've hit my OG before using 2-row and/or Pilsner.
I typically mash 5 lbs or so in a grain bag and the rest of the fermentables come from DME.