the fastest i have gotten it to go is 29 down hill with a tail wind and a bottle rocket tapped to the bumper. i can pull the hill in M gear at 9 and it will get there,L dosnt help with the speed or power on the way up and H is a crap shoot, i asked the owner yesterday about the grade of the hill and was told it is 1/2 mile long and 450 foot rise from top to bottom so i was close but it is really a climb</p>