Diet Coke
Diet Coke does not use a modified form of the Coca-Cola recipe, but instead an entirely different formula. The controversial New Coke, introduced in 1985, used a version of the Diet Coke recipe that contained high fructose corn syrup and had a slightly different balance of ingredients. In 2004, Coca-Cola introduced Coca-Cola C2, which it claims tastes much closer to Coca-Cola but contains half the carbohydrates. In 2005, the company introduced Coca-Cola Zero (replaced by "Coca-Cola Zero Sugar" in 2017), a sugar-free variation of regular Coca-Cola.
Frisch's
Frisch's was known for its "cherry" and "vanilla" Coke but switched to Pepsi products in December 2013. Frisch's cited a better deal from Pepsi, and deemed taste tests adding the same vanilla and cherry flavorings to fountain Pepsi acceptable. However, the change stirred numerous protests at Frisch's Facebook page from customers unhappy with the loss of Coke. Frisch's noted that Toledo area franchised stores have served Pepsi for "a number of years". Big Boy Restaurants International previously switched from Coke to Pepsi in 2001, similarly citing a "great, interesting proposal" by Pepsi. Frisch's new owners were aware of the controversy, and in June 2018, CEO Jason Vaugn announced that Coca–Cola was returning to Frisch's Big Boy restaurants by September. Coca–Cola reappeared at Frisch's Mainliner restaurant on July 27, 2018 with other stores to follow. Cincinnati Reds catcher Tucker Barnhart was on hand to pour the first Coke at 11 am.