I'm pretty sure that if your density is greater and your volume is the same your mass will be greater which means you will be doing more work. (well at least most of the time it does, in some cases mass can get canceled out ( I've learned this after many tricky engineering physics ))
It seems that density is very closely tied to viscousity also, I'd be interested in a liquid that is more dense than another but yet less viscous.
-Sidney
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