Engine Fuel Burn from Horsepower (BSFC)
The fuel burn in gallons per hour from engine power and brake-specific fuel consumption: lb/hr = HP x BSFC, gph = lb/hr / fuel density (diesel ~7.1, gasoline ~6.1 lb/gal), and run time = tank / gph. A 300 hp diesel at BSFC 0.37 burns 15.6 GPH (12.8 hours on a 200 gal tank); the same power from a gasoline engine (BSFC 0.50) burns 24.6 GPH, 58% more. The burn at the entered power; real duty-cycle burn is lower. A planning aid; the engine's fuel map and a measured burn govern.
Formula and source
gph = horsepower x bsfc / fuel_density; run_hours = tank / gph; diesel ~7.1 lb/gal, gasoline ~6.1 lb/gal.
Brake-specific fuel consumption (BSFC) fuel-flow relation, standard engine-performance practice by name; first-principles mass-to-volume conversion.
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