Originally Posted by
mstateglfr
The more knobs(lugs), the slower you go.
Actually lots of little low knobs roll better than fewer larger higher ones. Not like a slick but closer. Something like the Kenda Slant Six rolls pretty well on pavement if you want/need knobs for when off pavement. I road tour on slicks, or near slicks, but have done mixed surface tours on XC race tires and found them to work pretty well.
BTW, on a slightly different topic. I tend to wear out what I have on the bike before worrying about changing tires unless they are something pretty unpleasant or very unsuitable for the tour I am planning.