gasolineequivalent

Gasoline equivalent, often written as gasoline-equivalent or GGE, is a unit of energy used to compare fuels with gasoline. It represents the amount of energy contained in one US gallon of gasoline, commonly taken as about 33.7 kilowatt-hours (kWh) or roughly 120–125 megajoules.

It is used to express energy contents and, when paired with efficiency data, to compare different fuels and powertrains. For example, electric vehicles' energy consumption is sometimes given in kWh per 100 miles, which can be converted to miles per GGE by treating one GGE as 33.7 kWh.

In practice, GGE is used for fuels such as natural gas (CNG, LNG), hydrogen, propane, ethanol, and electricity, to facilitate apples-to-apples comparisons with gasoline. For instance, a natural gas vehicle's energy consumption might be expressed in GGE per 100 miles, allowing direct comparison with gasoline-powered vehicles.

Limitations: It does not account for differences in engine efficiency, energy losses in production and distribution, or vehicle powertrain characteristics. Also, different organizations may define the exact GGE value for a given fuel slightly differently, which can affect comparisons.

See also: MPGe, energy content, energy density.