Convert from hartree to gallon [U.S.] of automotive gasoline

Unit Definition (hartree)
The hartree is a unit of energy used in atomic and moleclar physics, equal to about 4.3598 x 10E-18 joule or 27.212 electron volts. The unit is named for the British physicist and mathematician Douglas R. Hartree (1897-1958).

Unit Definition (gallon [U.S.] of automotive gasoline)
U.S. liquid gallon is legally defined as 231 cubic inches, and is equal to (exactly) 3.785411784 litres (1 L = 10-3 m3) or about 0.13368 cubic feet. This is the most common definition of a gallon in the United States. The U.S. fluid ounce is defined as 1/128 of a U.S. gallon.