What soda is highest in caffeine? A definitive guide
                                
                                
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                                    4 min read                                
                            
                                With many zero-sugar varieties now packing more punch than their classic counterparts, the race for the highest caffeine soda is closer than ever. For a long time, traditional Mountain Dew was a top contender, but its zero-sugar cousin and other brands have since surpassed it.