er, just thinking out loud here…
i often think in terms of 'hills' in the peak district before i think of distance.
ie, a 4 hill ride, or a 2 hill ride, and the 'planning ahead' part of my brain usually reckons that each hill will take about an hour; up + faffing + down + faffing.
even after a longish ride, 4 or 5 hours, it's interesting to see how little distance i've actually covered.
this was a long-winded way of saying: about 5miles an hour. Yes i can go quicker, but only if i don't stop for photo's / faffing / views / chatting / cake / pork pies.