Gas Type by Car: Regular, Premium, Diesel or E85 / Ram / C/VRam C/V Gas type by year YearGas type2015Regular (flex-fuel E85 engine available)2014Regular (flex-fuel E85 engine available)2013Regular (flex-fuel E85 engine available)2012Regular (flex-fuel E85 engine available) Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).