Dynamo: Fuel Efficiency (seen ingame as the Secondary Gearbox, Flux Linkage Optimization and CryoCoil Regulator) is a type of Augment that causes Dynamos to consume fuel at a slower rate while still outputting the same amount of power, resulting in higher amounts of generated Redstone Flux in the long run.
This Augment type consists of three Levels. Level I increases the amount of energy generated from a unit of fuel by 10%, Level II by 35% and Level III by 85%.