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Fuel Energy Comparisons: Gasoline Gallon Equivalents (GGE)

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Energy Equivalency Calculation

Using fuel energy equivalents provides the user with a comparison tool for gauging various fuels against a known constant that has relative meaning. A common method of measurement is the Gasoline Gallon Equivalent. The chart at the bottom of this page arrives at the equivalent measurement by comparing the BTU content per unit of each fuel type and then calculating the ratio.

What’s a BTU?

As a basis for determining energy content of a fuel, it is helpful to understand exactly what a BTU (British Thermal Unit) is. Its scientific definition goes something like this: British Thermal Unit - The amount of heat (energy) required to raise the temperature of 1 pound of water by 1 degree Fahrenheit.

Think of it this way: it's basically a standard. Just as PSI (pounds per square inch) is a standard for measuring pressure, so too is a BTU a standard for measuring energy content.


See GGE conversion chart below

Gasoline Gallon Equivalents
Fuel Type Unit of Measure BTUs/Unit Gallon Equivalent
Gasoline (regular) gallon 114,100 1.00 gallon
Diesel #2 gallon 129,500 0.88 gallons
Biodiesel (B100) gallon 118,300 0.96 gallons
Biodiesel (B20) gallon 127,250 0.90 gallons
Compressed Natural Gas (CNG) cubic foot 900 126.67 cu. ft.
Liquid Natural Gas (LNG) gallon 75,000 1.52 gallons
Propane (LPG) gallon 84,300 1.35 gallons
Ethanol (E100) gallon 76,100 1.50 gallons
Ethanol (E85) gallon 81,800 1.39 gallons
Methanol (M100) gallon 56,800 2.01 gallons
Methanol (M85) gallon 65,400 1.74 gallons
Electricity kilowatt hour (Kwh) 3,400 33.56 Kwhs


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