Compressed Natural Gas is sold in GGEs or gasoline gallon equivalents. A GGE has the same energy content (124,800 BTUs) as a gallon of gasoline. CNG is generally 15-40 percent less than gasoline or diesel. The District’s CNG rates are set on a monthly basis and are posted under Compressed Natural Gas. Rates for private fueling with compression done by the customer are generally $.50 cents less per GGE. These rates include all State and Federal road taxes.