I brewed an American brown ale this weekend. When I measured the SG pre-boil, I got 1.057 on 7.25 gallons, implying an efficiency of about 67% (disappointing). After the boil, I got an SG reading of 1.068 on 5.7 gallons, implying an efficiency of 62%. For the pre-boil reading, I cooled the sample down to 65 degrees and corrected for the 5 degree difference from 60. I measured the post-boil sample at about 73 degrees and corrected for temperature.
When I sampled the pre-boil, I stirred the wort first and took the sample from about the middle of the kettle, so I wasn't measuring the first-runnings. After the boil, I ran about 1/3 of the wort into the fermenter and took a sample from the spigot at the bottom of the kettle.
What gives here? Did I do something incorrectly? What is my actual OG?
When I sampled the pre-boil, I stirred the wort first and took the sample from about the middle of the kettle, so I wasn't measuring the first-runnings. After the boil, I ran about 1/3 of the wort into the fermenter and took a sample from the spigot at the bottom of the kettle.
What gives here? Did I do something incorrectly? What is my actual OG?