I haven't yet spent the money to get an owner's manual, but it's on the to-do list (parts first, paper second). Stopped on the way home and filled up for only the second time since I bought it and I wasn't paying any attention the first time. I simply wanted it to make it home from where I bought it (150 miles away). It was close to empty, showing about an 1/8 of a tank or so. It only took 12 gallons, so I am guessing I have the 14 gallon version. Thanks for the info. It was darn nice paying under $50 to fill up. The last tank full on the F-150 was almost $90. That bad boy is sitting on the dealer's lot collecting dust where it belongs.