If you are new to the boat you can probably expect about 30. There are about 8mph hiden in subtle adjustments. I've got 40+ on IB4200WC's after a year of learning. If you don't have a gps then don't worry about it becuase if you have it doing 30 you'll swear it's doing way better than that. It's still a handful on anything other than glass water. Those batts aren't bad. Read the super tune thread to learn where to squeeze the boat. Have fun.