What Diet Soda Has the Most Caffeine?
                                
                                
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                                    3 min read                                
                            
                                With 68 milligrams of caffeine per 12-ounce can, Mountain Dew Zero Sugar surprisingly stands out as the diet soda with the most caffeine. This might be an unexpected finding for those comparing common colas, as the caffeinated punch varies significantly across different brands and formulations.