For propulsion which runs on electricity, normally kW For liquid fuels, normally the quantity of energy input is measured in terms of the liquid's volume, such as litres or gallons. Nonetheless, several conversions are applicable, depending on the unit of distance and on the unit of energy. In the International System of Units, the energy efficiency in transport is measured in terms of metre per joule, or m/J. 7 Note - External costs not included above.Via type of fuel used and rate of fuel consumption, energy efficiency is also often related to operating cost ($/km) and environmental emissions (e.g. Different types of transport range from some hundred kilojoules per kilometre (kJ/km) for a bicycle to tens of megajoules per kilometre (MJ/km) for a helicopter. The energy efficiency in transport largely varies by means of transport. The more efficient the vehicle, the more metres it covers with one joule (more efficiency), or the fewer joules it uses to travel over one metre (less consumption). Therefore, in the International System of Units, the energy efficiency in transport is measured in terms of metre per joule, or m/J, whilst the energy consumption in transport is measured in terms of joules per metre, or J/m. To avoid said confusion, and to be able to compare the energy efficiency in any type of vehicle, experts tend to measure the energy in the International System of Units, i.e., joules. Nonetheless, fuel consumption is linked with a means of propulsion which uses liquid fuels, whilst energy efficiency is applicable to any sort of propulsion. The inverse of the energy efficiency in transport, is the energy consumption in transport.Įnergy efficiency in transport is often described in terms of fuel consumption, fuel consumption being the reciprocal of fuel economy.

The energy efficiency is also occasionally known as energy intensity.

The energy input might be rendered in several different types depending on the type of propulsion, and normally such energy is presented in liquid fuels, electrical energy or food energy. The energy efficiency in transport is the useful travelled distance, of passengers, goods or any type of load divided by the total energy put into the transport propulsion means.

Ton kilometre