Why, thank-you for saying so! My philosophy is, the roses smell better when you're going faster. AND, you are able to smell more of them in your allotted time.

Another thing about going from 15 to 19 mph is, it depends on the "moderate hills." I've been in central Tennessee several times, and in lots of places, doing 19 mph overall can be an Olympic-caliber ride. So, my first advice is to choose your route wisely! If you want to improve your overall speed, you have to push yourself into your 'discomfort zone.' The payback is the endorphines! Nothing feels as good as the rush you get after finishing a hard ride.