Gas Type by Car: Regular, Premium, Diesel or E85 / Chevrolet / Van 1500/2500Chevrolet Van 1500/2500 Gas type by year YearGas type2008Regular (flex-fuel E85 engine available)2007Regular (flex-fuel E85 engine available)2006Regular2005Regular2004Regular2003Regular2002Regular2001Regular2000Regular Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).