F-250 diesel gets 22mpg on the highway. You can easily get dual 25 gallon tanks, and I've seen them with extra 60-70 (yes, this is absurd). With 50 gallons you'd have about 1k miles range. (I've driven one with dual big tanks, but it also had about 3000 extra pounds of weight and run-flat tires and modified suspension, so it wasn't really comparable, and never went above 50mph)
A VW Jetta can get 45mpg if you're really lucky, with a 14.5gal tank, so about 650.
ML350 is about 700 miles, and the old TDI VW Passats were about a 20 gallon tank and good for about 1000 miles stock.
A VW Jetta can get 45mpg if you're really lucky, with a 14.5gal tank, so about 650.
ML350 is about 700 miles, and the old TDI VW Passats were about a 20 gallon tank and good for about 1000 miles stock.