Put it in your head. Coca Cola Co. proves it can be wild and crazy with this one. Mr Pibb is probably the most accurate imitation of Dr Pepper, but I cannot find it for sale anywhere on the east coast. Just as well, though, because it's not that great. If you can't find a can, there's an easy way to simulate the taste: pour some DP in a glass of ice, let the ice melt, the add an equal part of corn syrup. I give it an 8.
There are two more ingredients in this than in Dr Pepper. I noticed that Dr Pepper says "artificial and natural flavors" while all imitators say "natural and artificial flavors." Mr Pibb takes the spin one step further and says "to protect taste" instead of "preservative" like the others. To protect and preserve (TM)
When hard up for DP, this is an okay replacement. My roommate says it tastes better than DP, but he likes to be argumentative. If you really need to save 10 calories, this could be the way to go, I guess.