Took the lightweight road bike today instead of the somewhat heavy and high rolling resistance commuting/touring bike as I have to run a couple of errands after work on the other side of town and up a reasonably steep hill. Got to work noticeably faster than usual. Of course, the extra speed is offset by an extra few minutes of prep time gearing up and packing my backpack. I'll make the time back up though on the errands after I clock out.