I've heard this as well -- "bad rolling resistance" I dunno -- there do seem to be conflicting opinions about this. FWIW, I've certainly never noticed it, although I will say that if I overinflate my tires, if anything rr goes up a touch. I tend to work out proper inflation based on Sheldon Brown's chart (using tire width and load [front/rear]) and stick with that. OTOH, I do think that some of the new-generation Schwalbes (e.g. Supreme), with more sophisticated puncture-resistance technology, may well be better than Paselas as far as rolling resistance goes; the Paselas do use a conventional kevlar (I think) 'breaker strip' under the tread, which does slightly increase rr, at least in theory, all else being equal.