Soda~Fact: Mountain Dew John-Bryan Hopkins One 12 ounce can of Mountain Dew contains approximately 54 mg. of caffeine. Share Me:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)MoreClick to email a link to a friend (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Like (Opens in new window) Categories: Uncategorized