The results were from a full tank, I put 85 miles on it in one day, filled it up today as it was at 3/4 tank and did the math.
Why couldn't this rig get close to 17mpg? Our 2001 Ram 2500 5.9 Magnum V8 gets about 19mpg and thats closer to 7,000lbs Vs. the Landcruisers 4,200lbs.
I will say though, with its 25gal tank, it sure is a gas hog Lol! Its not really underpowered, its quicker then either of my Subarus, plus it has the torque to get you up to 60 pretty quick, Slow revving Inline-6 FTW
Not just start calculating with a full tank, but use a full tank (ok, well don't run out...). Then run the numbers. If I fill up at the top of a mountain pass and drive downhill for 85 miles, then fill up again. My gas mileage would be amazing! But you'll get a better average over 20 gallons of gas than 4.