This is based on the ratio of electrical energy entering the manufacturing plant to energy in a gallon of the fuel. If you base it on the efficiency of a diesel electric generating plant to produce the electricity it works out to about 20 percent. This means that 5 gallon of diesel fuel in an electric generating plant would produce about one gallon of this fuel.
Sounds like they be wanting some of that government grant money. Researchers are always ‘embellishing’ the numbers.
Good catch.