I have a new UMBP 2.93Ghz, 320 GB 7200RPM HDD that seems to be using a lot of power in sleep mode. I close all apps before I go to work in the morning and unplug the power, close the lid. 8 hrs later I come back and it goes from 100% to 80%, I did have a black macbook that would go to 93% when I came home. I'm just wondering if it is because this is a more powerful mac and therefore uses more power? Or if my battery is a piece? I just calibrated it yesterday and now I'm showing 11 cycles and 98% battery health and it was 100% health yesterday. Also it's on the energy saving settings. Thanks for the help.