Ok, there have been some threads on this issue. Apple.com now reports diminished battery life expectations from the last model even though the new MBPs use penryn processors that are supposed to consume less power. It has been said that these new estimates are based on a more trying "internet productivity" standard. This is illustrated nicely in the following article: http://crave.cnet.com/8301-1_105-9879648-1.html HOWEVER, when I check the macbook air's page, it says the same test based on "wireless productivity" estimates 5 hours for the Air and yet every single reviewer that has tested the MBA finds it gets well less than 5 hours with basic productivity tests, and some have barely made 4.5 hrs without running anything intensive. Is the Apple battery test really new?? Or are they just relabeling it so that no one gets upset with lowered performance??