Gasoline Gallon Equivalents for Alternative Fuels

Fuel British Thermal Unit (Btu) Estimates for Transportation Vehicles (Lower Heating Values)

  British Thermal Units Per Unit of Fuel (rounded) Alt Fuel Unit in Gasoline Gallon Equivalents Alt Fuel Unit in Diesel Gallon Equivalents Example for Converting into GGE  
Diesel Gallon127,5001.1401.0005 Diesel Gallons = 5.7 GGEs5 x 1.14
Gasoline Gallon1111,8001.0000.877GGE = Gasoline Gallon 
Liquefied Natural Gas (LNG) Gallon71,1000.6360.55812 LNG Gallons = 7.632 GGEs12 x 0.636
Compressed Natural Gas (CNG) Therm93,0000.8320.72910 CNG Therms = 8.32 GGEs 
E85 Gallon
85% Ethanol, 15% gasoline
81,7000.7310.64110 E85 Gallons = 7.31 GGEs 
B20 Gallon
20% biodiesel, 80% diesel
125,4001.1220.98410 B20 Gallons = 11.22 GGEs 
B100 Gallon
100% biodiesel
117,1001.0470.91815 B100 Gallons = 15.705 GGEs15 x 1.047
Liquefied Petroelum Gas (LPG/Propane) Gallon83,2000.7440.65315 LPG Gallons = 11.16 GGEs15 x 0.744
Hydrogen Gallon27,8000.2490.21810 Hydrogen Gallons = 2.49 GGEs 
Electricity (kilowatt-hours/kWh)3,4120.0310.027100 kWh of Electricity = 3.1 GGEs

Footnote:
1. Gasoline value is a revised number not yet endorsed by California Energy Commission.

Source: California Energy Commission, Transporation Energy Division, Fossil Fuels Office Table 2-5, Pg. 2-16, Full Fuel Cycle Assessment Well to Tank Energy Inputs, Emissions, and Water Impacts, TIAX Consultant Report, February 2008, publication # CEC-600-2007-002-D

Note: For transportation applications Lower Heating Values are used. Listed values are consistent with GGE conversions performed in the 2009 Integrated Energy Policy Report with regards to transportation issues. Estimates may not reflect the sales-weighted average for California for any specific year. In reality, these numbers vary based on feedstock supply and specifications. Numbers were generated based on California Air Resources Board-approved specification for gasoline prior to 2007, which have since been revised.

Other potential sources for Gasoline Gallon Equivalents conversions: Argonne National Laboratory's GREET Model, California Air Resources Board (CARB), U.S. Dept. of Energy: Energy Information Administration Clean Cities Reports.