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It may not be the hardware; it may be the the OS. Since upgrading to Sierra, I've been plagued by various runaway kernel processes randomly eating 100% of the CPU. Have finally managed to kill most of them through deleting .plists and the like -- all for native MacOS apps like Contacts by the way, not in any 3rd-party apps -- but this kind of bugginess could easily produce the kind of results that Consumer Reports saw.

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"we experimented by conducting the same battery tests using a Chrome browser, rather than Safari. For this exercise, we ran two trials on each of the laptops, and found battery life to be consistently high on all six runs"

Specifically it looks like it might be a Safari problem.

Mind to share the list of .plists that you have deleted and disabled?

Oh gods, I didn't keep a list. Most had no effect, but I eventually traced it to Contacts, and with the exception of a couple of even more mysterious rogue issues with the windowserver, that seems to have fixed it.

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