The October issue of Brew has a recipe on Page 59 that has me confused.
The Neshaminy Creek Brewing Co.s Maximum Porter Clone all grain version has an OG of 1.066.
Using the .65 efficiency standard and the potential extract data on page 4 of the issue for the malts listed, and allowing a very generous 100% efficiency for the 4 oz. of coffee-infused dark chocolate (not sure how to calculate that), I come up with 283 GUs.
Since lactose is not fermentable, I did not add any GUs for the 1.5 lbs of lactose.
But shouldn't 5 gals at 65% efficiency require about 330 GUs for OG of 1.066?
By my calculation, the OG would be about 1.056. What am I not understanding?
Thanks for your reply.