I go as fast as the WIND let's me. Same as for any bike. The second last day of my last tour, I was cruising on the flat freeway/ highway at 25 to 32 mph, with a 120 lb bike. When I stopped for lunch at the A+W, * 3 * drivers came over and commented > you was flying. LOL. The second day going, I had a 30+ mph direct headwind, I got 23 miles at 3.5 mph.
My SA XL-RD5w is my speed machine. 9 mph wind + 9% slope = near 46 mph on a 1/2 mile hill near here.
I have 2 videos to prove it. The first was my maiden voyage for my tour bike custom. The second was after I added a whole bunch of CF addons, frame bag and weight. LOL.