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T470 or X270. I have a screenshot of powertop 2.8 on my "old" T470 showing a discharge rate of 5.29W, in iGPU mode, linuxmint w/cinnamon, spideroak, thunderbird and firefox. Screen about 60% illumination.

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With a little more work you can get either of those to do under 3W. I get near 20h of use on both my t450s and x270

I would love to know how you got to that point

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