Game Fuel is Citrus Cherry Mountain Dew. Amazing taste, but I know it's bad for you. I try to limit myself.
And yeah I only know of the Halo 3 and WoW versions. The WoW version had two variants, one was Citrus Cherry like the Halo 3/4 version and one other flavor that I didn't even bother to try. It was purple though.
For Let's Plays, Walkthroughs, and Gameplay videos: http://www.youtube.com/user/TheStitchRS