Gas Type by Car: Regular, Premium, Diesel or E85 / Genesis / G80Genesis G80 Gas type by year YearGas type2027Premium2026Premium2025Premium2024Premium2023Premium2022Premium2021Premium2020Depends on engine: premium or regular2019Depends on engine: premium or regular2018Depends on engine: premium or regular2017Depends on engine: regular or premium Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).