Talk:Ability Efficiency/@comment-94.71.244.98-20151004205644/@comment-96.244.86.114-20151005074943

Fleeting Expertise still helps in the case that it isn't your only efficiency or duration mod. Energy multiplier (what the base cost is multiplied by, lower is better) is now (2 - Efficiency) / Duration, which when you just use Fleeting Expertise is 0.4 / 0.4 = 100%. When paired with just Streamline, your net energy usage is 0.25 / 0.4 = 62.5%, nominally better than just Streamline's 70%. When paired with just Continuity, it's 0.4 / 0.7 = 57%, better than just Continuity's 77%, and with all three, it's 0.25 / 0.7 = 36%, better than 54% without Fleeting Expertise.