Exercept from Life's little mysteries
Quote: "For one thing, The Coca-Cola Company has used high-fructose corn syrup rather than sugar in the American version of its soft drink since 1985. That was the year it scrapped the "New Coke" formula— which spent only a few months on the market after the company was flooded by consumer protests — and reverted to a recipe similar to the one it had used up until 1985 (except switching the sweetener to corn syrup).
According to Pendergrast, current Coca-Cola Classic is also made with phosphoric acid instead of citric acid – another change not reflected in the leaked recipe. Small tweaks, yes, but they produce a drink that isn't quite right by today's standards." End quote.
It looks like Coca-Cola changed the formula of Classic Coke at the same time they re-instated in back in 1985. Notice the last sentence, "Small tweaks, yes, but they produce a drink that isn't quite right by today's standards."