I have a ST 34. At planning speeds, about 13 to 20 knots we normally get about 1 to 1.1 NM per gal. When we were fully loaded with fuel, water and stuff for the loop, we were only getting .9 to 1 NM per gallon at planning speed. if we slowed down to about 6 to 6.5 Kt we get about 3.5 NM per...