Several members asked about expected fuel consumption on a C380. The responses were pretty consistent:
It’s going to vary a bit depending on your prop set up and sea conditions. My typical fuel consumption is better than on the chart Rich shared. It is a matter of RPMs and the sweet spot for consumption versus boat speed for my boat is in the 2200-2500 RPM range. I typically burn ~ .75 gallons per hour in that range and can make 6+knots.