The other day I was at Chuck E Cheese's, and in the soda fountain they had Pibb Xtra and Mello Yello. I first got a cup full of Pibb Xtra, then later I refilled it with Mello Yello. Without realizing it, I still had Pibb Xtra in my glass. I tasted it and from what I could remember, it tasted just like Surge. So, I figured out how much of each drink it took to make it, and it turned out to be 1/4 Pibb Xtra, and 3/4 Mello Yello.