13tons
The 2009 Ford F250 6.4 liter diesel pickup truck has a listed towing capacity of 8500 pounds. The manufacturer recommends that you do not exceed the towing capacity.
around 9000lbs give or take
It should be the 6.8 liter engine and the capacity is 6 quarts
6.0 gallons
The conventional towing capacity for a 1983 Ford F250 with a straight six is between 12,000 and 14,000 pounds. The fifth wheel towing capacity is up to 16,000 pounds.
between 3000 to 5000 miles if highway only change at the upper limits if towing or server conditions use the lesser
10000 Lbs @ 2500 rpm
Mine is 6.5 quarts. I have an 04 Superduty with the 5.4 liter V8...
The different sizes refer to the engine and towing capacity. The larger sizes generally effect the fuel economy as well. You can find the specifications at http://www.fordf150.net/specs/05sd_specs.pdf
The fuel capacity of a Ford F250 7.3 liter long bad truck is listed as 28 gallons. Ford offered an option for a second fuel tank doubling the fuel capacity.
When properly equipped, a 2002 F250 7.3L powerstroke is tow rated up to 12,500 lbs, if you add a fifth wheel hitch it can tow 14,500 lbs. However I own a 2002 F250 7.3L Powerstroke with a 6 speed manual, 3.73 rear end, crew cab, short bed and I tow over 25,000 lbs from the bumper hitch 4+ times a week. I have even towed a 39,000 lb trailer from Utah to Mexico City (also from the bumper hitch).
The size of the Engine, Cab, and bed determine the towing capacity of a truck. You have listed none of these so it is impossible to tell you it's rating. I suggest you go to the web page listed below and click on "Tow Rating". Locate your truck to see what it can tow.