I just got a Macbook Air 13" / i5 / 4 / 128 and I'm getting around 8h with moderate usage. (Intense) Browsing with several tabs (No Flash, just text and images) Screen Brightness - 75% Keyboard brightness - 50% Spotify Ocasional YouTube music video Small downloads and a couple of small apps installs. Mail Word docs Nothing in the background. So I can say I'm a little underwhelmed with these 8h. How about yours?