I have a Sony Vaio E series and I installed both Ubuntu 12.04 and 12.10. In every case, my battery life is reduced of almost a half with respect to Windows 7. The power consumption with no program running is around 18 W, opening Firefox or Thunderbird goes over 30!
I have tried laptop-mode-tools and Jupiter, tweaks on the kernel suggested on the Ubuntu website here, but nothing changed.
I ran powertop, but before studying to understand what it says I read about some Linux regression problems on power consumption. In fact, I have the same problem with Fedora 17 and OpenSuse 12.2 on this laptop. My brother has an Acer and he has the same problem. So, I'd like to know if other people have the same issue, or it is just related to some machines.