A 20-oz Dr Pepper bottle lists 68 mg of caffeine, while a 12-oz bottle lists 41 mg.

A 12-fl-oz Dr Pepper has 41 mg of caffeine, and a 20-fl-oz bottle has 68 mg.

One 12-fl-oz can of Diet Coke contains about 46 mg of caffeine.

Diet Coke has 46 mg of caffeine per 12 oz, while an 8 oz cup of brewed coffee often lands near 95 mg, with big swings by bean and brew.

A 12-oz can contains 41 mg of caffeine, listed by the brand for the U.S. can.

A 12-oz can contains 54 mg of caffeine, while a 20-oz bottle contains 91 mg.

Diet Dr Pepper has 41 mg of caffeine per 12 fl oz can in the U.S., which puts it in the mid-range for caffeinated soda.

A 12-oz can of Diet Mountain Dew contains 54 mg of caffeine.

One 20-oz bottle of Diet Coke has about 77 mg of caffeine in the U.S., based on Coca-Cola’s stated 46 mg per 12-oz serving scaled to 20 oz.

One 12-fl-oz can of Diet Coke lists 46 mg of caffeine, while caffeine-free Diet Coke lists 0 mg.