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No problem. I do notice battery lasts longer when I read e-books rather than browse the Internet, but that's quite natural.
However, I'm certain about the brightness difference, because we discussed this with the Marvin author: some e-reader apps reduce screen brightness by overlaying whatever is on the screen, with a black layer, leading to little or no battery savings. While other e-reader apps, like Marvin, actually adjust screen brightness on the hardware level, helping to extend the tablet's battery life while reading e-books. I think only newer iOS versions make this possible.
That's why such general charts and stats make little sense, even if they pretend to measure battery life "while reading e-books" -- it may all come down to the e-reader apps the user prefers to use, screen brightness within the apps, etc. This is very individual, and will vary from user to user.
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