Indiana Code Title 6. Taxation § 6-6-2.5-22

Sec. 22. As used in this chapter, “special fuel” means all combustible gases and liquids that are:

Special fuel includes biodiesel and blended biodiesel (as defined in IC 6-6-2.5-1.5) and natural gas products. However, the term does not include an alternative fuel, gasoline (as defined in IC 6-6-1.1-103), ethanol produced, stored, or sold for the manufacture of or compounding or blending with gasoline, kerosene, and jet fuel (if the purchaser of the jet fuel has provided to the seller proof of the purchaser's federal jet fuel registration at or before the time of sale).