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Most of the sugar in wines is fermented away, but some remains. Depends on the wine.

I'll point out though that there is no sugar in Coke, only high-fructose corn syrup.

High-fructose corn syrup contains large amounts of sugar.

Well, that's true, but it's not what people are generally referring to when they say "sugar". But technically I suppose that's correct.

I'm assuming red wine's residual sugar is in the form glucose, but could be wrong.

That's not true for all Coke. Mexican Coke still uses cane sugar; as does Coke in a lot of countries that have primarily kosher / halal consumers.

Damn, I need to try some Coke next time I'm in Mexico then.

If you have a Costco membership, they'll occasionally carry Mexican Coca-Cola in the 12 ounce glass bottles. That's the stuff with the cane sugar (and why it will usually be displayed away from the soda).

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