Against my own better judgment and after unsubscribing from this thread, I came back to it yesterday morning and again this morning. I will post just this one more time to say that I am happy for you that you bought an 11 inch MBA, you won't be sorry. I would have told you so yesterday but your post failed to make clear to me at least that you had bought an MBA.
Don't worry too much about the 11 inch MBA's battery life. When I am working emails, surfing the Web, and not much else, my 13 inch MBA customarily gets at least 6 or 7 hours from a charge and if I am using it only off an on during the course of the day, I can easily go from first thing in the morning until bed time on one charge.
Battery life takes a hard hit when you are using a bunch of Flash enabled sites, particularly streaming video from, for example, Hulu or Netflix. My grandson has a 13 inch MBP. Although its battery is rated at 10 hours, if he is dong a bunch of streaming video, he can get only about 4 hours from it. I learned that lessen a couple of nights ago when I watched several hours of Netflix streamed videos on my 13 inch MBA, after first having spend about an hour on another Flash enabled site. As a result of the strain I was putting on it, my battery indicator turned red after less than 4 hours. No Macbook, MBP, or MBA, running OS X is going to have the kind of battery life that the iPad and other iOS devices will have. The upside, of course, is that a real OS X computer has the ability to do exponentially more than any iOS device. The point of this is to urge you not to be hung up on your 11 inch MBA's sometimes relatively short battery life and celebrate its many strengths. Good luck!