Pat Anderson
New member
Jim, I really don't believe in talking about fuel economy based on Navman readings...I watch that of course to see what is relatively more efficient, but if you want to know your real fuel economy, you need to log miles traveled since last fill up, and divide by gallons required to fill. You then have a true average economy number. And you probably want to do it over a long time so you pick up all kinds of wind and current conditions - which for sure affect fuel economy. I can tell you, on our boat, it is always considerably lower than what we might think just looking at the Navman instantaneous readings. I would then use the lowest average fuel economy for trip planning.