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Found you from FTE.
Well my thought with idi 7.3L I used to own 87 F250 6.9L they are alike.
They get horrible mileage when it cold so you could try running little hotter thermostat like powerstroke 7.3L come with 203oF
They don't like run low rpm work. Mine get worse mileage if I have rpm around 1300-1600. Try run at 1700-2000 rpm it should improve.
City mile is BIGGEST KILLER. I try coast much I can in high traffic in city. It get 18-20 in warmer weather. In winter it 14-15.
I got much better mileage if I put about 2-3 gallons of used clean oil in tank. I did put oil in there first then go to diesel refill then reset mile. After that I refill with straight diesel. I saw 21 mpg city but it was slightly running hotter.
What psi you running on tires?
Have you thought of rewire switch to torque convertor to stay LOCK while you cruise 45 mph but turn off so it let rpm drop to idle while you coast.
My 00 F350 if I keep overdrive off I can let rpm drop to 600-700 while coast 25 to 55 mph. If I let overdrive ON it annoy it keep Lock torque convertor too early when you are try to coast it act like brake.
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