I have a cyclocross Trex XO-1. The tires on it are knobby Bontrager Jones Cyclocross tires (http://www.bontrager.com/model/00433/) They are 34c. Would upgrading to some road hardcase tires be better for commuting in terms of speed? My commute is strictly pavement though some parts are bumpy and rough due to cracks, potholes, etc. I am thinking of getting Bontrager Race All Weather Hardcase tires (http://www.bontrager.com/model/09184) at 25-28c. Basically how much faster/easier will my hilly commute be?