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`powertop --auto-tune` can set some settings to "good", but it may in fact be counterproductive, e.g. setting USB to autosuspend that suspends a mouse that shouldn't be, etc. See here for more info. In my experience/research, it doesn't really do much.
thermald settings can also affect battery life/performance a lot.
I'm currently running TLP which allows some finer-grained control.
s-tui is useful for CPU frequency, temperature, and TDP monitoring (make sure to run it with sudo for power details). It also has a nice stress test.