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consider alternate ABV calculation method #48
I could be misinformed, but it seems the ABV calculation method used in brewtarget is less accurate for higher gravity beers. For a large barleywine this accounts for 1%+ discrepancy in calculated ABV.
Using the standard method my OG/FG of 1.098 works out to about 9.9%
My source on this information is http://www.brewersfriend.com/2011/06/16/alcohol-by-volume-calculator-updated/
btw, thanks for great software, and Cheers!