* Gasoline: Most 2012 F-150s used regular unleaded gasoline. Specific octane recommendations varied depending on the engine.
* E85 (Flex Fuel): Some 2012 F-150s were available with Flex Fuel engines, capable of running on gasoline or a blend of up to 85% ethanol (E85). This would be clearly indicated on the vehicle's badging.
To know for certain what fuel *your* specific 2012 F-150 uses, check the fuel filler door or your owner's manual.