I would guess I am at ~30 mph for ~50-60% of my ride. Obviously I have to deal with traffic lights, car traffic, and near my work is more inner city style roads, which forces me to slow down. My average trip speed on the majority of my rides hovers around 24mph for the trip. (I use a Magellan Cyclo computer, so I get trip info on every ride.) On my way to work in the morning, I have had my average speed at 27+ mph for the first 20 miles before I get slowed by the city.
I am pedaling hard my entire ride. I don't have a Watt meter for myself, but I'd guess I am averaging 150-200W from myself during my rides, I use a high cadence of at 80-110 RPM.
Also FWIW, I generally only charge my battery to 80% to promote longevity, but I do have the 52V battery. There is more power and speed available from the bike at 100% charge, but I'd rather my battery last more years.