Maybe it'll be different in Metal-backed El Capitan, but my experience so far has been that the discrete GPU universally degrades my battery life. I'm glad I ha

Maybe it'll be different in Metal-backed El Capitan, but my experience so far has been that the discrete GPU universally degrades my battery life. I'm glad I have it though; sometimes I need it, but it'd be nice if I could just disable it completely most of the time.