* Gasoline: Most 2013 Ram 1500s used regular unleaded gasoline. This was the fuel for the majority of its engine choices.
* Flex-Fuel (E85): Some engine options were available with flex-fuel capability, meaning they could run on gasoline or E85 (a blend of up to 85% ethanol and 15% gasoline). You would need to check the specific vehicle's specifications to determine if it was equipped for E85.
Therefore, the answer depends on the specific engine configuration of the 2013 Ram 1500 in question. Most commonly it used regular unleaded gasoline, but some could use E85.
