times distance per unit of energy, in the SI, passengers metres per joule (pax.m/J); while for cargo transport the energy efficiency is normally measured in terms of mass of transported cargo times distance per unit of energy, in the SI, kilograms metres per joule (kg.m/J). Volumetric efficiency with respect to vehicle capacity may also be reported, such as passenger-mile per gallon (PMPG), obtained by multiplying the miles per gallon of fuel by either the passenger capacity or the average occupancy. The occupancy of personal vehicles is typically lower than capacity by a considerable degree and thus the values computed based on capacity and on occupancy will often be quite different. Typical conversions into SI unit Liquid fuels Energy efficiency is expressed in terms of fuel economy: distance per vehicle per unit fuel volume; e.g., km/L or miles per gallon (US or imperial). distance per vehicle per unit fuel mass; e.g., km/kg. distance per vehicle per unit energy; e.g., miles per gallon equivalent (mpg-e). Energy consumption (reciprocal efficiency) is expressed terms of fuel consumption: volume of fuel (or total energy) consumed per unit distance per vehicle; e.g. l/100 km or MJ/100 km. volume of fuel (or total energy) consumed per unit distance per passenger; e.g., l/(100 passenger·km). volume of fuel (or total energy) consumed per unit distance per unit mass of cargo transported; e.g., l/100 kg·km or MJ/t·km. Electricity Electricity consumption: electrical energy used per vehicle per unit distance; e.g., kW·h/100 km. Producing electricity from fuel requires much more primary energy than the amount of electricity produced. Food energy Energy consumption: calories burnt by the body's metabolism per kilometre; e.g., Cal/km. calories burnt by the body's metabolism per mile; e.g., Cal/miles. Land Passenger Transport Table Overview In the following table the energy efficiency and energy consumption for different types of passenger land vehicles and modes of transport, as well as standard occupancy rates, are presented. The sources for these figures are in the correspondent section for each vehicle, in the following article. The conversions amongst different types of units, are well known in the art. For the conversion amongst units of energy in the following table, 1 litre of petrol amounts to 34.2 MJ, 1 kWh amounts to 3.6 MJ and 1 kilocalorie amounts to 4184 J. For the car occupation ratio, the value of 1.2 passengers per automobile was considered. Nonetheless, in Europe this value slightly increases to 1.4. The