energy equivalent of a gallon of gasoline
(2) Alternative fuels (A) In general There is hereby imposed a tax on any liquid (other than gas oil, fuel oil, or any product taxable under section 4081 (other than such tax at the Leaking Underground Storage Tank Trust Fund financing rate))— (i) sold by any person to an owner, lessee, or other operator of a motor vehicle or motorboat for use as a fuel in such motor vehicle or motorboat, or (ii) used by any person as a fuel in a motor vehicle or motorboat unless there was a taxable sale of such liquid under clause (i). (B) Rate of tax The rate of the tax imposed by this paragraph shall be— (i) except as otherwise provided in this subparagraph, the rate of tax specified in section 4081(a)(2)(A)(i) which is in effect at the time of such sale or use, (ii) in the case of liquefied petroleum gas, 18.3 cents per energy equivalent of a gallon of gasoline, (iii) in the case of any liquid fuel (other than ethanol and methanol) derived from coal (including peat) and liquid hydrocarbons derived from biomass (as defined in section 45K(c)(3) ), 24.3 cents per gallon, and (iv) in the case of liquefied natural gas, 24.3 cents per energy equivalent of a gallon of diesel. (C) Energy equivalent of a gallon of gasoline For purposes of this paragraph, the term “energy equivalent of a gallon of gasoline” means, with respect to a liquefied petroleum gas fuel, the amount of such fuel having a Btu content of 115,400 (lower heating value). For purposes of the preceding sentence, a Btu content of 115,400 (lower heating value) is equal to 5.75 pounds of liquefied petroleum gas. (D) Energy equivalent of a gallon of diesel For purposes of this paragraph, the term “energy equivalent of a gallon of diesel” means, with respect to a liquefied natural gas fuel, the amount of such fuel having a Btu content of 128,700 (lower heating value). For purposes of the preceding sentence, a Btu content of 128,700 (lower heating value) is equal to 6.06 pounds of liquefied natural gas.