Gas Type by Car: Regular, Premium, Diesel or E85 / Dodge / Neon/SRT-4/SX 2.0Dodge Neon/SRT-4/SX 2.0 Gas type by year YearGas type2005Depends on engine: regular or premium2004Depends on engine: regular or premium2003Depends on engine: regular or premium Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).