Macs have a hibernate option that completely powers the machine off after saving the contents of RAM to disk, but you need to set it via the terminal. Find the

Macs have a hibernate option that completely powers the machine off after saving the contents of RAM to disk, but you need to set it via the terminal. Find the current hibernate mode via: pmset -g The default is hibernatemode 3 (RAM stays powered on until battery drops below some threshold, so that wake from sleep is very fast). The version of “hibernate” you want is mode 25: sudo pmset -a hibernate mode 25 If you routinely keep your computer 'hibernating' for days at a time without plugging it in, you’ll save some battery life this way at the expense of a slower wake-up time because RAM is not kept powered. See https://en.wikipedia.org/wiki/Pmset https://en.wikipedia.org/wiki/Pmset for more details. > Safari is optimized for power consumption relative to Chrome and Firefox This is a very big difference. Chrome has zero respect for battery life.