Forbes reported  earlier today that a new cross-promotion with Pepsi will allow Modern Warfare 3 players to gain more XP faster. When players purchase Mountain Dew, Doritos, or both, they will get special codes to enter. These codes, dubbed Rank Up XP, will allow for a small time window where all of the XP a player earns will be doubled. The amount of time for how much product you buy is shown in the graph above.
- Forbes - Modern Warfare 3's Pepsi Cross Promotion Steps Over the Line
- http://www.rankupxp.com/Teaser - Official Promotion Site
- Smuff's old blog about Mountain Dew offering MW3 XP