My early morning rides from midnight to 6AM on either the 36 pound hybrid or 29 pound touring upright bar bikes are easy riding 15mph moving average for up to 80 miles depending on time of the start. Same rides on my road bikes will be increased by 3mph. Dealing with my prostate cancer last year and a rotten right shoulder that was replace 7 weeks ago today also contributes to slower speeds. Being 66 now has also played a minor roll in easing back.