> 10h

disable lid sleep (well, disable sleep entirely on osx 10+ because apple don't want to give you the option to disable lid sleep only) and it will never pass 4h.

the 6/8/10h some people claim is because they don't realize the computer is sleeping most of the time. I guess it is fine if it's just your facebook terminal...

Not if you're running Docker it doesn't.

If you actually run stuff the Dual Xeon system won't be sitting at 75W either.