Gas Type by Car: Regular, Premium, Diesel or E85 / Audi / A7Audi A7 Gas type by year YearGas type2025Premium2024Premium2023Premium2022Premium2021Premium2020Premium2019Premium2018Premium2017Premium2016Depends on engine: premium or diesel2015Depends on engine: diesel or premium2014Depends on engine: diesel or premium2013Premium2012Premium Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).