Hey,
I do a bunch of on highway driving / towing with my Dodge TD. My truck has about 200,000 miles on it and is still running strong. My fuel sending unit in my tank has been broken since about the 110,000 mile mark, which is no big deal because when I’m running light (not towing) I zero out the odometer at every fill up. I can then run 450 miles before I have to start looking for a fill-up station. I ran the last 90,000 miles using this “system” of measurement without ever running dry. Not any more. With the new ULSD I run dry at 400 miles.
Have you noticed any mileage difference when using ULSD?
Yea — I’ve lost about 1 MPG consistently. I keep mileage records on every fill up and every trip in our F-350 (for IRS purposes) and I’ve seen our mileage go down since ULSD became the norm. I do not know to what to attribute this, because I have no figures for BTU content of ULSD vs. the old #2. All I can say is that I used to see between 18 to 20 MPG on our F-350 (empty) on the highway here in Nevada, and now 18 is the high end of the mileage; we never get 20 any more.
Just over 100K miles on the 7.3L Powerstroke.