Surely a lot of this comes down to the screen? Battery life varies greatly between e.g. Google Chromebook systems, running the same software (and between windo

Surely a lot of this comes down to the screen? Battery life varies greatly between e.g. Google Chromebook systems, running the same software (and between windows systems for that matter). Some of this is to do with the power usage of the CPU, and whether video decoding is done in low power hardware, or which wireless chipset is used. But just looking at the power usage manager on your Android phone will tell you that the screen uses most of the power. Windows hardware varies from high priced ultra books (where all is sacrificed for shininess and performance), to bargain bin systems where using an old backlighting technology saves a few bucks. Question to Apple users - comparing windows laptops to your mac, which shipped with the more aggressive power saving settings in terms of turning the screen off when not in use?