Yes using powertop, ive been able to get my last intel laptop (thinkpad t440) to ~8W and my latest amd laptop (a hp 745 g3 carrizo) to ~10W. Initial value on the intel laptop from memory was ~24W and on the amd laptop it was 21W.
This is a good start http://linrunner.de/en/tlp/docs/tlp-faq.html Depending on your HW/distro/DE, you might want to start playing around with powertop --calibrate and TLP. Highly suggest switching to a lightweight DE like i3.
