Looking for clues as to why my OG on my number 8 was about 18 points low.
20 lbs Pilsen malt
2.75lbs crystal 120 (had to sub for Belgian cars)
2 lbs brown sugar
1 lb cane sugar
Mashed grains at 148 with 7.5 gallons. Drained 3 gallons them remembered I forgot I add two gallons for absorption. I then added it mixed and continued draining. Ended up getting another 3 gallons runoff. Put another 6 gallons at 170 degrees , stirred, let it so 3-4 minutes and drained
Boiled 60 minutes with sugar additions coming at 10 minutes.
Checked OG after cooling about halfway through draining the boil pot and got an OG of 1.066
I usually get 80+% efficiency.
Any ideas on what could have gone wrong