My new 13" 2013 MBA does not approach those 12 hours of battery reported by reviews or even the supposed "more reasonable real-life estimates" of ~10 hours. Not even on Mavericks DP3. This is no way due to my usage - simply browsing Safari with about 7 tabs with NO browser plugins (Flash/Java) enabled, I'm getting no longer than 8 hours. If I try and do just about anything else that people usually do with laptops, I get about 6.5 hours. This is with around 3 menubar apps running and almost nothing else. My battery is not defective - it reports a capacity of 7125/7150 mAh. This is also not some sort of fluke accident - I've been using this computer for 2 weeks now and have been consistently getting these numbers, both on Mountain Lion and Mavericks DP2/3. Interestingly, Windows on Boot Camp gives me very similar battery life as well. So what the heck is going on?