Learn why a fuel consumption gauge is key…
Calculate boat fuel consumption
by Alex
Expert answer:
Quick answer
Estimating boat fuel usage involves knowing engine size (hp), load, and cruising rpm. Typically, you check GPH (gallons per hour) at certain speeds to plan trips.
Detailed answer
Boat fuel consumption can be estimated by referencing engine performance data (like a fuel consumption chart) or using real-time flow meters if installed. Most data is expressed in gallons per hour (GPH) at different rpm or speed settings.
For example, if your boat engine burns 5 GPH at a normal cruise speed, and you plan a 3-hour journey, you’d expect about 15 gallons used—plus some safety margin for detours or rough conditions. Larger or twin-engine boats might double or triple that figure.
Wind, waves, and load (passengers, gear) also play a role. Heavier boats or rough seas can raise usage beyond the chart’s baseline. Using a methodical approach—recording engine hours and fill-ups each trip—helps refine your calculations. That way, you can plan fuel stops, control costs, and ensure enough fuel for safe return.