This is an interesting thread for me because I bought a '96 F250 diesel new in 1996 and am still using it. I promised one of my grandsons I'd give it to him when I'm too old to drive, but since I'm only 77, that may be a while yet. (Not too old to dream)
I bought the truck strictly to haul a travel trailer, so that's why I only have about 77000 miles on it at this point.
Because this is a fuel economy forum, I'll say that hauling a 27-foot Airstream trailer I average around 16MPG at my towing speed of 60MPH. Hauling a squared-off Jayco trailer of about the same size, I realize about 14MPG towing. The difference involves towing round v square at highway speed.
Not towing, I average around 23MPG at 55 MPH and 21MPG at 70MPH, but as I noted, I rarely drive it without something tugging on its tail. My differential is a 3.55, which has worked out well for me.
Just one more note: I converted the factory warm-up valve on the turbo to an exhaust brake with two electric switches: one on the electrically-actuated solenoid on the valve which sends engine oil to the exhaust valve to open and close it; the other on the torque converter lockup circuit so I can assure the converter is always locked up coming down a grade with the exhaust brake in play.
This truck was a wise choice in 1996 for me. It still is.
Good luck with yours.
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