Miles Per Gallon Gasoline Equivalent - Conversion To MPGe

Conversion To MPGe

MPGe is determined by converting the vehicle consumption per unit distance, as determined through computer modeling or completion of an actual driving cycle, from its native units into a gasoline energy equivalent. Examples of native units include W·h for electric vehicles, kg-H2 for hydrogen vehicles, gallons for biodiesel or liquefied natural gas vehicles, cubic feet for compressed natural gas vehicles, and pounds for propane or Liquefied petroleum gas vehicles. Special cases for specific alternative fuels are discussed below, but a general formula for MPGe is:

For EPA, this considers the tank-to-wheel for liquids and wall-to-wheel energy consumption for electricity, i.e. it measures the energy for which the owner usually pays. For EVs the energy cost includes the conversions from AC to charge the battery. The EPA MPGe ratings displayed in window stickers do not account for the energy consumption upstream, which includes the energy or fuel required to generate the electricity or to extract and produce the liquid fuel; the energy losses due to power transmission; or the energy consumed for the transportation of the fuel from the well to the station.

Basic values for the energy content of various fuels are given by the defaults used in the Department of Energy GREET (Greenhouse gases, Regulated Emissions, and Energy used in Transportation) model, as follows:

Note: 1 KWH is equivalent to 3,412 BTU

Fuel Unit Btu/Unit KWH/Unit
gasoline gallon 116,090 34.02
diesel gallon 129,488 37.95
biodiesel gallon 119,550 35.04
ethanol gallon 76,330 22.37
E85 gallon 82,000 24.03
CNG 100 SCF 98,300 28.81
H2-Gas 100 SCF 28,900 8.47
H2-Liq gallon 30,500 8.94
LPG gallon 84,950 24.9
methanol gallon 57,250 16.78

The energy content of a particular fuel can vary somewhat given its specific chemistry and production method. For example, in the new efficiency ratings that have been developed by the United States Environmental Protection Agency (EPA) for battery electric vehicles (BEVs) and plug-in hybrid electric vehicles (PHEVs) – see below – the energy content of a gallon of gasoline is assumed to be 114,984 BTUs.

Read more about this topic:  Miles Per Gallon Gasoline Equivalent

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Miles Per Gallon Gasoline Equivalent - Conversion To MPGe - Hydrogen Example With GGE
... The 2008 Honda FCX Clarity is advertised to have a vehicle consumption of 72 mi/kg-H 2 ... Hydrogen has an energy density of 120 MJ/kg (113,738 BTU/kg), by converting this energy density to a GGE, it is found that 1.012 kg of hydrogen is needed to meet the equivalent energy of one gallon of gasoline ...

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