The DTE on the red truck is just about spot on. When I brought it into CA I had to get it weighed as every PU truck is registered commercial. It needed to be under 5000 lbs to save a few bucks in weight fees. I weighed it as it normally is and it was 5100 lbs with 3/4 tank. I took out the spare and everything lose (jack & tools, ect) that would come out. Let it run down to fumes and it weighed 4900 on the nose. The DTE had said 0 for about 6-8 miles. I drove it about a mile to a Chevron and put in 26.8 gallons.
The Silver truck when it was new ran out going up a hill when the DTE said 11 miles to go.
As has been said earlier, don't run your tank down past 1/8 for many reasons.
The pump will not like it and you could be walking.............