U.S. Department of Energy - Energy Efficiency and Renewable Energy

Vehicle Technologies Office – EPAct Transportation Regulatory Activities

Fuel Conversion Factors to Gasoline Gallon Equivalents

Use these conversion factors to calculate the gasoline gallon equivalent (GGE) of alternative fuels. These conversion factors help state and alternative fuel provider fleets report their compliance with Energy Policy Act (EPAct) requirements using the Alternative Compliance method.

Fuel Type Fuel Measurement Unit Conversion Factor GGE Calculation
B100 Gallons 1.066 GGE = B100 gal x 1.066
CNG @ 2400 psi Gallons @ 2400 psi 0.191 GGE = CNG gal @ 2400 psi x 0.191
CNG @ 3600 psi Gallons @ 3600 psi 0.287 GGE = CNG gal @ 3600 psi x 0.287
CNG @ 3000 psi Gallons @ 3000 psi 0.239 GGE = CNG gal @ 3000 psi x 0.239
CNG Hundred cubic feet 0.877 GGE = CNG ccf x 0.877
Diesel Gallons 1.155 GGE = Diesel gal x 1.155
E85 Gallons 0.734 GGE = E85 gal x 0.734
Electricity kWh 0.031 GGE = Electricity kWh x 0.031
Gasoline Gallons No conversion needed GGE = Gasoline gal
Hydrogen (kg) kg 1.019 GGE = H2 kg x 1.019
Hydrogen (gallons) Gallons 0.256 GGE = H2 gal x 0.256
LNG Gallons @ 14.7 psi and -234˚F 0.666 GGE = LNG gal x 0.666
LPG Gallons 0.758 GGE = LPG gal x 0.758