Fuel and/or propulsion system type
Fuel and/or propulsion system type means the variety of fuel and/or propulsion systems used in a motor vehicle, as follows: compressed natural gas (CNG); compression ignition fuel (CIF); electric battery power (EBP); fuel-cell power (FCP); hybrid electric vehicle (HEV); hydrogen combustion power (HCP); plug-in hybrid (PHV); spark ignition fuel (SIF); other (OTH), and unknown (UNK).