I have a year old Droid X and have been changing roms looking for one that has good battery life. I have gone through Liberty 2.0, Liberty GB, Apex, and am now on Dark Slide GB. I also just purchased an brand new extended battery, but i still have the problem of battery life. Every time I flash a new ROM i also erase the battery stats and fully charge the battery....but just yesterday the battery went down 40% in a 20 minute car ride using the GPS....any other thoughts?

Thanks in advance