[0xbadcafebee]

That's gonna depend on the distro and kernel, as different ones have different drivers, different power saving things, different apps. In general all modern distros should have decent support for power saving out of the box, but things like wifi cards typically have crap/buggy drivers when it comes to power saving (but again it depends on the hardware and driver)

That said, the spec sheet MobileMark benchmark says battery life is as good as 14.3 hrs in max battery setting on WUXGA Low Power (non-touch), Win 11, 52.5Wh battery, versus a performance mode getting 5.0 hrs on 2.8K OLED (non-touch), Win 11, 39.3 Wh battery. With 'local video playback' lasting longer. So I guess it's very hardware and use-case specific. (https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad_T...)