What is fuel efficiency by mass?

Fuel efficiency by mass measures distance traveled per unit of fuel mass (km/kg or miles/lb) rather than volume. This is used for aviation (jet fuel weight varies with temperature) and comparing different fuel types by their energy content per kilogram rather than per liter.

Why is fuel measured by mass in aviation?

Aviation fuel is measured by mass (kg or lbs) because jet fuel density changes significantly with temperature and altitude. Measuring mass (weight) gives a consistent fuel quantity regardless of temperature. Jet-A fuel density is approximately 0.8 kg/L but varies from 0.775 to 0.84 kg/L depending on temperature.

How does fuel density affect conversions?

Converting between volume and mass requires knowing the fuel's density. Gasoline: ~0.74 kg/L. Diesel: ~0.83 kg/L. Jet-A: ~0.8 kg/L. Example: 50 liters of gasoline x 0.74 kg/L = 37 kg. A car with 12 L/100km fuel consumption uses about 8.88 kg per 100 km.

What is the energy content of different fuels by mass?

Energy content per kg: Gasoline = 44.4 MJ/kg, Diesel = 45.6 MJ/kg, Jet-A = 43.2 MJ/kg, Hydrogen = 142 MJ/kg (highest of all fuels), Lithium battery = 0.5-0.9 MJ/kg (much lower than liquid fuels). This is why hydrogen has potential as a fuel but storage is challenging.

Fuel Efficiency - Mass Converter

Convert between m/kg, km/kg, mi/lb and more fuel efficiency by mass units.

About Fuel Efficiency by Mass

Fuel efficiency by mass measures how far a vehicle travels per unit mass of fuel consumed. This is relevant for aviation and rocketry where fuel weight matters more than volume.

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Fuel Efficiency - Mass Converter

About Fuel Efficiency by Mass

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