Mr Pibb was an unsolved mystery to me too until a few weeks ago. Mr. Pibb is a Coca-Cola product. Dr. Pepper is a product of the Dr. Pepper company. However, Dr Pepper Co. doesn't bottle Dr. Pepper. If you are in a region where Pepsi bottles Dr. P, then you can find Mr. Pibb as a competition to it. If Dr. P is bottled by Coke (like it is here in Philly), then Mr. Pibb is not available. This also explains why Dr. Pepper can sometimes be found in either Coke or Pepsi vending machines. I have seen Pibb in the South, the Rockies, and Canada (not sure about our friends in other countries). However interestingly, I have never seen Pibb in a two liter bottle, like Dr. P., only in cans, 20 oz., and 1 liter bottle.
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