I have had my Lance Duke 150 up to 65mph on a slight downhill the speedo is about 5 mph off it was showing 70, my buddy has a high dollar motorcycle and he says we were only doing 65, also I weigh about 190lbs, it does ok in the 45mph or less. If it is a flat 55 or 60 you will be ok too. I get between 75-80 mpg