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I hear this "lugging" thing a lot, but I can't decide whether it actually makes sense or not. The friction in an engine doesn't start going up until well below idle speed, and at higher speeds the components are definitely under a lot of stress. Efficiency does go down near 1000-1500rpm typically but I think this is probably because the burning charge has too much time to cool down. The only thing I can see is that the rods are under max compression for a longer period of time but I don't think this is much of an issue especially for naturally aspirated engines.
old greg do you mind sharing your wisdom? :P
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