* 6.2L V8 gasoline engine: This was a common choice.
* 6.7L Power Stroke V8 turbo diesel engine: This was also a popular option.
There wasn't a single engine size for the entire model year. To know the exact engine size of a specific 2012 F-250 Super Duty, you'd need to check the vehicle's documentation (like the owner's manual or the sticker on the driver's side doorjamb).