Mountain Dew (stylized as Mtn Dew in the United States) is a carbonated soft drink brand produced and owned by PepsiCo. The original formula was invented in the 1940s by Tennessee beverage bottlers Barney and Ally Hartman and was first marketed in Marion, Virginia, Knoxville, Tennessee and Johnson City, Tennessee. A revised formula was created by Bill Bridgforth in 1958. The Mountain Dew brand and production rights were acquired by the Pepsi-Cola company in 1964, at which point distribution expanded more widely across the United States. Between the 1940s and 1980s, there was just one variety of Mountain Dew, which was citrus-flavored and caffeinated. Diet Mountain Dew was introduced in 1988, followed by Mountain Dew Red which was introduced and subsequently discontinued in 1988. While Mountain Dew Red was short-lived, it represented the beginning of a long-term trend of Mountain Dew being produced in different flavor variations.
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