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IIRC, I believe the front tank is 18.5 gallons and the rear is 17. I may be a little off, but that's a pretty good idea. It's in the owner's manual and my Chilton's, but I just don't have either in front of me right now.
Hope this helps.
That sounds right for a long bed, which is what I have, and I am just going by what I observe at the pump. Lately takes a lot of $$$ to fill up my truck.