From EcoModder:
Automakers are trying to encorporate fuel saving technologies into their cars...The gauge will be showing up in 2010 Ford hybrids, and will include two modes, “Journey” and “Empower.” Journey mode will seem just like a normal gauge cluster for everyday driving, but for ecodrivers or information junkies, Empower mode will tell you about your vehicle’s performance and how you can improve the fuel economy.
