Comment 9 for bug 638434

Did you read this page which suggests that setting it to "Always Low" might not be the best plan?

http://www.codon.org.uk/~mjg59/power/good_practices.html

In essence the machine can go to sleep for less time because it takes longer to do things.

However if you have actually found better power usage than nohz=off then I'll give it a go and see how much slower the system feels.