Originally Posted by Ashz
In my experience any thing is a possibility when you don't mill the grain yourself. I will say that the 90/- and the wee heavy grain bill were milled at the same time by the same LHBS.
I would say it was definitely the crush, however you did another batch that worked fine from the same time? Maybe the first one the mill was working fine and the next it was off? Again, is there any chance they stiffed you a few lbs. of grain? Did you weigh it out yourself?
Wish I could help more. I agree it was not the temperature though. That would not give you a lower efficiency unless
your thermometer was off and you were actually below sacchrification temps, lower than 142 or so.
Keep some DME on hand next time and you can just use it to get to the right gravity. It won't hurt. Of course don't worry about it this time. It will turn out just fine.