There are a few reasons why Coca-Cola tastes better when ordered at McDonald's. According to the fast food brand, it follows guidelines that are set by Coca-Cola to ensure that the beverage tastes as high-quality as possible anytime guests order it at McDonald's locations across the nation. Jaap Arriens/NurPhoto/GettyAnother reason why McDonald's Coca-Cola tastes so delicious is because the chain gets the beverage syrup delivered in stainless steel tanks, The New York Times previously reported. McDonald's also notes that another reason why their Coke products taste so good is because of the straws they use. "It's slightly wider than a typical straw so all that Coke taste can hit your taste buds," the fast food chain states.