Well I think you would need double the power draw to get half the battery life, but that's not the point.

I guess I was working under the assumption that the CPU doesn't drain much power when there aren't any computations running . I don't see what it needs to be computing when the system is essentially be used as an e-reader (or at least it doesn't need to be thinking any more than the Kindle DX would with every page turn). Even with a faster processor, given that the EE has more than double the battery capacity, it seems like the device should have the potential to match or beat the DX in terms of battery life in e-reader mode (with snappier response times).

I fully appreciate your point that its a new device from a new company, and perhaps I shouldn't expect such a versatile device to beat more specialized devices. Nevertheless, part of the appeal of e-ink is that draws so little power that it enables weekly charging, so its a shame if the background OS with nothing running is draining the battery faster than the E-ink page turns.