I have a PW1 and generally keep the light level at about 6-8 (I find that anything above 8 in general ambient light indoors starts looking a bit too bluish / obviously lit for my liking). My preferred font size is usually the third one from smallest to largest.
With these settings (and WiFi off unless I'm actively downloading content), I've found I can go about 3-4 average size novels (300-400 pages in print equivalent) with one charging, and I never let the charge go under ~25-30% before recharging.
It's perhaps a little less than my old Kindle 3, but I can't say I've really noticed a difference in practical use. People with a preference with higher light levels may of course find a more noticeable difference in real life use.
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