For comparison, our 2520 XLD with a 2014 single 300 Yamaha, averages 2.1 to 2.2 mpg at 4300 -4400 rpm. (This yields 30-32 mph). ... With a full load of 200 gallons of gas, water tank, coolers, heavy bimini, fishing gear, 3 people etc, it averages 1.8-1.9. mpg. But, I seldom have the tank full...