Sometimes I wonder if those averaging 30+ km/h have set their computers up correctly for their tire size ... or if that 30+ km/h average is over an 11 km Time Trial.

You just got back on the bicycle again after a winter off, didn't you? Well, getting good usually involves building up base miles in the latter part of the winter, and then working on speed during the early part of the spring ... and it does take time.

Although I'm not really the one to speak about speed, an hour a day is what I do (or try to do) in the winter to just maintain my fitness level.