This weekend is the first time that I have done a measured experiment to determine my GPH burn rate. According to my calculations, determined over the course of two runs of 25 miles each way across the lake, I am burning 10 GPH (2.5 mpg) at 3600 rpm at 30 mph with a V-20cc with a carburated 1998 Merc 225 offshore turning a 19p stainless no brand prop. I got this in a relatively mild sea state with the jackplate up as far as it will go(anti-ventilation plate at the surface) and a touch of bow down on the tabs. I add that there were a few starts and stops across the way and a bit of idling time while I was fetching frosted barley pops from the cooler.
Does this sound about right performance wise and is there anything I can do besides dialing the speed back further to increase efficiency
It seems close to me, but I figured it would be good for at least another .5 MPH. FWIW, with this same set up, the boat tops out at 51mph at 5700rpm. I'm just looking to gain efficiency any where I can to get to the big snapper offshore.
What say the brain trust
