Pibb Xtra (Also formerly called as "Peppo", and "Mr. PiBB") is a spicy cherry pepper style flavored soda released in 1972 and marketed by The Coca-Cola Company. As of 2012, it is sold in limited areas of the United States.
Pibb Xtra is a reformulation of Mr. PiBB that was released in summer 2002. Anything sold as "PiBB" in a store now is "Pibb Xtra".
Next time you think you see Mr. Pibb, check carefully as you will see the word "Mr." does not appear anywhere on the product. Also remember that many fountains serving "Pibb Xtra" never changed the label from the old "Mr. Pibb". Ask the restaurant to confirm the selection by checking the concentrate canister or bag-in-box and you will see.