Just added TLP (OpenSUSE tlp-1.0-1.1.noarch.rpm) to Mageia6 on my netbook.
Battery life with 60% juice still went from 2:15h with an active desktop (Palemoon browser with ~15 tabs) to 2:50h. Men that was an easy +26% battery life

Note this is on an eight years old netbook with Intel Atom 2nd Gen. and GMA 950. Newer AMD or Intel CPUs have (much) deeper "sleep steps" aka energy saving states.