It doesn't show that from around 10AM yesterday to 3PM, I was using the computer constantly for work. So it's more than you think. You can see my usage starting from 10AM to 3PM today:
It's shaved 8% away for the past 1.5 hours of screen-on time. Even if we just take that figure and extrapolate it, it comes out to about 18.8 hours of battery life, which sounds about right to me.
Note that during standby/sleep, it barely loses any battery at all.
P.S.: here, perhaps this will help?
It's reporting about 8 hours of screen on yesterday. That sounds about right to me. Today it's been about a bit less than 6. So let's say... total of 12 - 13 hours of screen on with 33% battery life left? That's not so shabby, is it? Incidentally, that also agrees with the 18.8 hours figure above.
And if you're wondering, all of last week, I sporadically had the MacBook plugged in to my monitor and acting as a desktop, so that's why there's not much battery usage. For some reason, it's telling me I'm using >100% battery on Wednesday, though.
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