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I think I misunderstood about how many days you had it and how many nights (I thought 2 nights, not only one). Generally speaking 9% in one day is too much, but you had wifi on some of that time (you said it didn't do the update automatically), plus you did an update, which takes some power.
As far as power used while you read, the page turns are what take the power. If you just leave it on a page, it takes very little power. So if you are experimenting and jumping around a lot, you are apt to use a lot more power than if you just sit and read normally.
However, after it sleeps all night see what it's at. It shouldn't be any less than 88 or 89, I figure. If it is, then I'd be concerned. If it's OK (88 or 89), use it for just reading for the day and see what it does. Should only drop 1-3%.
By the way, make sure wifi is OFF!
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