Alternative Fuel Tax
Compressed natural gas (CNG) and liquefied gas used for operating motor vehicles on public highways are subject to excise tax of $0.21 and $0.22, respectively, imposed on a per gallon basis. For the purposes of this tax, the Tennessee Department of Revenue uses a CNG gallon equivalent factor of 5.66 pounds (lbs.) and a liquefied gas gallon equivalent factor of 6.06 lbs. Liquefied gas includes combustible gas that exists in the gaseous state at 60 degrees Fahrenheit and at a pressure of 14.7 lbs. per square inch, but does not include gasoline, diesel fuel, or CNG. Government agencies are exempt from this tax.