Short, flat, city commute: 17 mph on a good day, 12 when I'm just moseying along
Long ride: 10-12 mph
Long, hilly, gravel ride: 8-9 mph
Off-road: 6-7 mph
(Trying to) keep up with a club ride: 19-20 mph
Fastest ever: 47.5 mph on a nice downhill run
Up a big hill: 2.5 mph is about as slow as I can comfortably go
Fastest flat ride: 25 mph (huge tailwind that day)
Why are there so many numbers? Mostly because this is an answer to a silly question.