Gas Type by Car: Regular, Premium, Diesel or E85 / Chevrolet / S10 PickupChevrolet S10 Pickup Gas type by year YearGas type2004Regular2003Regular2002Regular (flex-fuel E85 engine available)2001Regular (flex-fuel E85 engine available)2000Regular Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).