I finally got around to doing some serious tweaking with the ThinkPad’s power settings last night.
ThinkPads are known for being good at managing battery power, and of course the Pentium M/Centrino chipsets are just wonderful in that regard.
That said, most Centrino laptops and definitely the well-built Thinkpads can be tweaked significantly on the power side with the right program.
For those not afraid to play around with undervolting, the Notebook Hardware Control software (previously Centrino Hardware