I am embarrassed to say I am a bit addicted to the carbonated soft drink Mountain Dew.
It's the BEST!  I love it, too!  I drink Diet Mountain Dew for breakfast!  
Really? Me too! I drink as many as 4 per day. There are other citrus soft drinks, like Mello Yello and Sun Drop, but I like Mountain Dew the best!
Does Mountain Dew have the most caffeine?
Good question -- I think it does. I'm sure more caffeine has been added over the years since it was first invented in 1940! 
Wow - I had no idea it's been around that long! I'm glad our modern FDA hasn't banned it for the artificial food colors and extra caffeine!
rights were acquired from Tip by the Pepsi-Cola company, and the distribution expanded across the United States and Canada.
Between the 1940s and 1980s there was one variety of Mountain Dew, which was citrus-flavored and caffeinated in most markets. Diet Mountain Dew was introduced in 1988, followed by Mountain Dew Red, which was introduced and discontinued in 1988. In 2001, a cherry flavor called Code Red debuted. This product line extension trend has continued, with expansion into specialty, limited time production, region-
List of citrus soft drinks
In addition to PepsiCo's Mountain Dew, Coca-Cola's Mello Yello or Dr Pepper's Sun Drop, there are a variety of smaller or regional brands for citrus soda. In deference to Mountain Dew's leading position in the market segment, some brands also use the word "Mountain" in their names.
Citrus Drop/Citrus Drop Xtreme.
Big K Citrus Drop is the generic version of Mountain Dew sold at Kroger stores. Its name plays another citrus drink, Sun Drop