I found that xubuntu used more power than Linux Mint xfce. Not sure why. If you can manage in a virtual tty without X, the power savings are noticeable. But

I found that xubuntu used more power than Linux Mint xfce. Not sure why. If you can manage in a virtual tty without X, the power savings are noticeable. But by far the biggest savings will be disabling ethernet/wifi and reducing screen brightness.