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So you're right (and I sit corrected!) the Eheim is not all that efficient. I keep lurking the Eheim site for pump charts, but they're not up so far.
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I don't think you can draw that conclusion because:
1) Resistance is related to flow (higher flow = higher resistance due to diminished returns)
2) You varied flow between the two models.
Therefore you can't comment on pump effciency because we are unable to measure resistance relative two each flowrate (or a common flow rate).