Efficient

Efficient increases a system's power levels more when at lower power settings, based on the following formula:

SystemPowerBonus = (SystemEfficiency/300) x (75 - SystemPowerLevel) where SystemEfficiency is the system's total value from skills such as               Auxiliary, Engine, Shield or Weapons efficency stat, and SystemPowerLevel is the setting you select (i.e. 25, 50, 75, 100).

Increasing Efficiency Levels

 * Skills
 * (0-52 auxiliary)
 * (0-52 engines)
 * (0-52 shields)
 * (0-52 weapons)
 * Traits
 * (5 all systems)
 * (10 all systems)
 * Items
 * (15 weapons, shields, auxiliary)
 * (scales) (30 engines)
 * Items
 * (15 weapons, shields, auxiliary)
 * (scales) (30 engines)

Example
For example, if you have trait on your playable character (+10 efficiency to all systems), an  bridge officer (+5 efficiency to all systems), and have maxed out efficiency for Auxiliary systems (+52) and six of the nine ranks for Weapons systems (+40) then you'd see:

Auxiliary: SystemPowerBonus = (67/300) x (75 - SystemPowerLevel) at 25 power: +11.2 power at 50 power: +5.6 power at 75 power: +0 power Weapon:   SystemPowerBonus = (55/300) x (75 - SystemPowerLevel) at 25 power: +9.2 power at 50 power: +4.6 power at 75 power: +0 power Shield:   SystemPowerBonus = (15/300) x (75 - SystemPowerLevel) at 25 power: +2.5 power at 50 power: +1.3 power at 75 power: +0 power Engine:   SystemPowerBonus = (15/300) x (75 - SystemPowerLevel) at 25 power: +2.5 power at 50 power: +1.3 power at 75 power: +0 power

Thus, the most economical use of skill points in efficient systems is where you typically have low power settings as there is no effect once you're at a power setting of 75 or greater.