I have a Catrike Expedition which would be considered not a slow trike maybe average or better, aerodynamics seating position, faster rolling 26" drive wheel and higher gearing, and the results vary significantly with terrain. My usual 20+ mile ride I average about 10 MPH with the time being affected by it being 15# heavier than my road bikes, less than 20# to over 30#, where it cuts my hill climbing speed in half.