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Well, it's unlikely you'll ever get a strictly linear behaviour over time. WiFi is a major point: Wifi power management might have corner cases depending on usage not even related to the Kindle device.
Then there's document indexing, synchronization of user data to the corresponding Amazon account, background update downloading, background document downloading etc. etc. - well, even embedded fonts might be different in their needs for computation power (unlikely that this will really matter, but I wanted to illustrate the point). After all, what the meter will give you is a (still derived from other data, thus a few charge tries to teach the logic) estimation on the electrical charge within the battery.
This is not to say that the data you're writing down is meaningless. But always be careful to state a rule from singular evidence.
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