I Know that is Crazy attenuation, LOL! That is why I posted this, I have never seen anything like it in the years I have brewed. I used 2 cups of normal cane sugar, added to the boil.
I always make a nice big starter, but I don't think that would make it that low of an FG...
I used the hydrometer like always it was around 68F when I too the reading for FG
and about 80 when I took the reading for OG. Which I know changes it a bit but not that much??
OG in my notes says it was 1.063...I don't think it was a 5, but even if it went from 1.053 to 1.003 that would be a lot?