Ok I've been doing all grain for 3 years and never worried about my efficiency. Today i decided that I would see what it was. Now my 1st question. I know that I'm to take a reading after i sparge before I boil but since I do 10 gallon batchs and batch sparge how do you all take your readings. This is what I did today. Collected 5 gallons and took a small amount and put into a sauce pan. Colected another 2.5 gallons took small amount put it into sauce pan. Refilled my mash turn with water to get ready for second batch sparge. Started my kettle on 1st 7.5 gallons as I was waiting for 2nd batch sparge. after about 30 minutes I started collecting my run off again. Collected another 5 gallons once again took sample and added to sauce pan. Continued to collect the last of sparge and add small amount to sauce pan. So is there an eaiser way to get this reading? After doing this today I know why I never worried about it before. Beer still tasted great. Am I over thinking this?