Gas Type by Car: Regular, Premium, Diesel or E85 / Mazda / CX-5Mazda CX-5 Gas type by year YearGas type2026Regular2025Regular2024Regular2023Regular2022Regular2021Regular2020Regular2019Depends on engine: diesel or regular2018Depends on engine: diesel or regular2017Regular2016Regular2015Regular2014Regular2013Regular Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).