Using the calc to figure out the ABV of my coffee mead.

Using FF3.6.3 Linux i686 via a XWin session through PuTTy and XMing

Putting in the OG and FG the calculation is off by several percent, showing 11.97% ABV when I know it should be in the 17% range.

Not really that huge of a deal, but interesting to note that the calculator seems to be off using this combination