Originally Posted by DrPete
Try not tootling along at 19mph. A pair of aero wheels, and I'm talkin' some Zipp 404's or some other deep section wheel, will give you a slight boost (MAYBE 0.5 mph), but it sounds like you need to work on raising your LT if you are looking to improve your cruising speed... And that's free.
.5 mph is generous. That is about 3% increase, all else equal. Dropping your bar down 1" would make a much larger aero advantage.