Yamaha outboards range from ultra-portable 2.5 HP models to powerful 450 HP offshore engines. Their fuel consumption is generally calculated at ~0.075 gallons/hour/HP at cruising speed. Newer EFI models (like the XTO Offshore) are more efficient, but fuel usage increases significantly with engine size and load.
For example, a twin F250 setup running 4 hours might burn approximately 150 gallons. Always consider sea state, load, trim, and speed. Use this calculator to estimate fuel needs for planning day trips, longer cruises, or budgeting marine adventures.