Mass of Fuel per Brakepower per Second in Piston Formulas

No, the Mass of Fuel per Brakepower per Second, measured in Specific Fuel Consumption cannot be negative.

Mass of Fuel per Brakepower per Second is usually measured using the Kilogram per Second per Kilowatt[kg/s/kW] for Specific Fuel Consumption. Kilogram per Second per Watt[kg/s/kW], Kilogram per Hour per Watt[kg/s/kW], Kilogram per Second per Brake horsepower[kg/s/kW] are the few other units in which Mass of Fuel per Brakepower per Second can be measured.