Depending upon where you buy the soda, Coke products are made and distributed in the U.S. using cane sugar and not high fructose corn syrup. You can find them with the "Yellow Cap" in the Kosher section and...
Another way to find Cola-Cola with cane sugar is to seek out the Mexican formula, which is said to taste better than its American counterpart. It’s often difficult to find, but most Hispanic groceries and many restaurants are now selling it, along with some Costco and Kroger chain stores in areas with large Hispanic populations. Originally it was bootlegged in from across the border to keep local US bottlers from losing sales, but Coca-Cola now imports it into the US in small quantities.
Last year, Pepsi had both Pepsi and Mountain-Dew "Throwback" which was made with cane sugar as well. I'm not certain if that is still available.