3YM30, 480 lifetime hours on engine, 2009 Hunter 36, 0.58gph averaged over the two seasons I've owned it burning 75 gallons of diesel, mostly cruised at 3,000 RPM. Pretty happy with that. I've learned my fuel gage is fairly accurate, and my initial fuel burn calculations were too pessimistic (which is the side I'd prefer to err on). Keeping track of hours (or miles in a car) and knowing the average fuel consumption (or miles I can typically drive) is a habit I've always had, and it has never let me down with regard to never running out of fuel.