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Billy,
The full discharge advice doesn't apply to Lithium based batteries such as the one in Cybook. It applies mostly to older NiCd type batteries. On the contrary, if at all possible recharge well before battery is empty. Even if it is at 60% still recharge. I never got mine below 70% yet.
Regarding single charge duration, like others said it depends on all activity, including menu selections; even while idle it uses little bit. Marketing claims as always are too high. They often assume the optimal conditions which rarely occur. In general most users get at least one week, often more. That is plenty of time to find a USB port to plug into and recharge.
The power indicator, like in most electronics, is never 100% accurate. Therefore it doesn't change in linear fashion. Instead, like you discovered, below 50% it will drop faster and around 80%-100% it will drop much slower. It has to do with the difficulty of calculating SOC from battery voltage because voltage curve is not linear.
I find mine spends the most time between 80%-100% and then starts to decline at a faster rate. That means that displayed 80% is probably closer to 60%, while 60% is likely closer to 40% etc. The same thing happens for laptop computers.
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