Synopsis As Introduced Amends the Motor Fuel Tax Law. Provides that the tax imposed on the privilege of operating motor vehicles that use liquefied natural gas or propane is 21.5 cents per gallon. Provides that the tax imposed on compressed natural gas is 19 cents per gallon. Provides that, in the case of liquefied natural gas and propane, "gallon" means a diesel gallon equivalent. Amends the Weights and Measures Act. Provides that liquefied natural gas used as motor fuel shall be sold in diesel gallon equivalents, and compressed natural gas shall be sold in gasoline gallon equivalents. Provides that propane used as motor fuel shall be sold in actual measured gallon volumetric units, subject to adjustment for the purposes of determining the diesel gallon equivalents that are subject to the tax rates under the Motor Fuel Tax Law. Amends the Environmental Impact Fee Law. Provides that no fee is imposed on the importation or receipt of liquefied natural gas (i) sold to or used by a rail carrier or (ii) consumed or used in the operation of ships, barges, or vessels that are used primarily in or for the transportation of property in interstate commerce for hire on rivers bordering Illinois if the natural gas is delivered to the ship, barge, or vessel by a licensed receiver. Effective immediately.