I rode 47 miles last Friday with 2010 ft of elevation gain and averaged 20.5 mph.

My ride on Monday was 20 miles with 1980 ft of elevation gain and I averaged 17.7 mph.

My average speed drops significantly when I am doing hill repeats, but I know I am working much harder than just cruising along on the flats.

Flat ground, no wind under 50 miles - I can average about 21-22 mph. Max effort on flat ground no wind for 20 miles I can hit right at 25 mph.