Gas Type by Car: Regular, Premium, Diesel or E85 / BMW / 6 SeriesBMW 6 Series Gas type by year YearGas type2019Premium2018Premium2017Premium2016Premium2015Premium2014Premium2013Premium2012Premium2010Premium2009Premium2008Premium2007Premium2006Premium2005Premium2004Premium Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).