we usually run 6 miles unloaded to the river mouth, then load up the ballast (aprox 1800 lbs) then ride up river stopping to pick up fallen riders and such for 9 miles to the hwy 19 bridge, then turn around and head 9 miles back down to the river mouth and if we are done, we then dump ballast and go home, if not we turn around again and go back up river and this is usually around 1/2 tank