Gas Type by Car: Regular, Premium, Diesel or E85 / Nissan / XterraNissan Xterra Gas type by year YearGas type2015Regular2014Regular2013Regular2012Regular2011Regular2010Regular2009Regular2008Regular2007Regular2006Regular2005Regular2004Depends on engine: regular or premium2003Depends on engine: regular or premium2002Depends on engine: regular or premium2001Regular2000Regular Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).