I would say so... missed that.

Sounds like everything so far is money well spent.

 

Crank-yes a bad engine temp sensor will cause the ECU to overfuel the truck.
I had the same problem with my wifes Volvo.
MPG dropped like a rock, could not figure it out, temp gauge read normal.
Hooked up my scanner to read the engine temp.
Temp gauge said normal, scanner said 150*F, so I replaced the thermostat, its a 192*F t-stat.
So the engine should have been running around 195-200*F after that.
Nope, still 150 or so.
Replaced the temp sensor and the temp went to were it was supposed to be and MPG went back up.
So make sure you replace your thermostat, and if that does not help then the coolant temp sensor.

 

I took a run to Orange County today, 190 miles round trip. Mostly freeway travel but some in town miles, probably 15 miles of the 190. freeway speeds from 65 to 80, mostly at 75. There was also 15 miles of stop and go.......Got back filled up and got 15.2 mpg, not great and not bad. I suspect if I were doing straight freeway driving at 65 to 70 miles per hour that the mpg would have been up substantially, maybe as high as 18. I did get around 20 on the highway when I first bought the truck, before I changed to full synthetic, engine, diffs, transfer case (tranny is still conventional ATf). Also, no cruise control, I think I must have a bad ecu. It will come on very very infrequently but quickly shuts off after a few minutes. Phil

1999 DI 103k miles

 

Thermostat was replaced 6 months ago - went through a very frustrating time painting all my local streets green until we worked out the thermostat was stuck closed.
Now the truck sits well in temp range - thermo fans kick in on hot days when stuck at lights etc. Happy days.
but it is now costing me $1 a mile to drive it!
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I think most taxi's are cheaper than that aren't they?