Oh lord, not my gout! Although staining the grout in the laundry room might make me end up in pain!
I think with my syrah the SG was right at 1.092 or so. Around 23 brix. I think this will vary from grape to grape though and also with how ripe they are. I didn't mess with my grape bucket's SG, it seemed right to me for a syrah, so I went with it.
Most Syrah's I buy are 13-14%, and 1.092 should be at the low end of that range at 13.18% alcohol. But a grape like a Pinot Noir is usually less, closer to 12% or so from what I have seen. Some of this depends on the winemaker of course, but I don't believe a lot of sugar is added to wine made from grapes. That's actually illegal in some parts!
http://en.wikipedia.org/wiki/Chaptalization
Then you get into the late harvest wines where they let them stay on the vine and ripen even more to get the sugar up. Those guys can end up in the 15% range.