According to multiple sources, including Tasting Table, Eat This Not That, Sheffields Sweet Enough, DineWithDrinks, and Rethink Sugary Drink, the soda with the most sugar is Mountain Dew. The amount of sugar in a 20-ounce bottle of Mountain Dew is 77 grams, which is more than 18 teaspoons of added sugar. Other sodas that are high in sugar include Cherry Coke, Pepsi, Dr Pepper, Wild Cherry Pepsi, and Coca Cola. The sugar content of these sodas varies depending on the brand and flavor. It is important to note that consuming too much sugar can lead to health problems such as tooth decay, obesity, and diabetes.