You plugged in a power programmer to tear up the street when you mash the pedal. So, what about the 90% of the time when you are just cruising? Thankfully, automakers added the Active Fuel Management System to cut your available cylinders in half when you don't need them. While this system works well, it strangely operates only a third of the time. With a Range Technology Active Fuel Management Chip, your fuel saving system stays active when you need it the most, saving enough fuel for another run down the drag strip.