BatteryMark
It is amazing that the same notebook grabs the first and the last position in the same test. With full steam ahead the battery is used up within 69 minutes. When power management kicks in with semi brightness and the CPU running at only 200MHz, it nearly doubles the battery life.
The power consumption test, calculated from the available battery capacity and battery life, shows some interesting results. The difference between Toshiba 2800-500 (/Maximum Performance) running at 600MHz and ASUS L8400B 600MHz Speedstep is 7.1W. The ASUS notebook uses the good old BX chipset with S3 graphics and a 14" display.
These results are only the worse case figures. BatteryMark 4.0 also offers a Life-test with some breaks between the test runs where the power management can kick in.
The battery life increases significantly.