Training ride average speed strikes me as meaningless. I average 15-16mph on most solo rides around here (it's very hilly/windy), 17-19mph when I'm doing intervals over similar terrain. Sounds slow? My last two Master's 35+ races averaged about 25mph for 90 mins to almost two hours. I was comfortable in the peloton and pace line. I TT at 22-23 mph, hoping to bump that up.