Gas Type by Car: Regular, Premium, Diesel or E85 / Mercedes-Benz / SL-ClassMercedes-Benz SL-Class Gas type by year YearGas type2027Premium2026Premium2025Premium2024Premium2023Premium2022Premium2020Premium2019Premium2018Premium2017Premium2016Premium2015Premium2014Premium2013Premium2012Premium2011Premium2009Premium2008Premium2007Premium2006Premium2005Premium2004Premium2003Premium2002Premium2001Premium2000Premium Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).