Quality-Quantity Theory of Energy

Generally,
Mass Min = (Max Advantage / 2) + 1
Mass Max = (Min Advantage) + 1

Exhorbitant: Energy = Mass diff / Max Adv - range of Advantage.

Normally, exhorbitant energy is usable and generated. Sometimes, if the device is self-powered without fuel, the exhorbitant energy may be over-unity, although there are few examples of this so far.