I specifically got the 34-gallon fuel tank for extended range. I was told that if I first ran the fuel gauge to below E, and then ran the DTE (distance to empty) readout down as far as I dared, I could get an idea about how much fuel I could use. I did this, running the DTE down to 7 miles, but it only took 28.6 gallons to fill it up. I guess my question is what happened to the other 5 1/2 gallons? Are they usable? Are they in the truck at all? Are they just below the pickup line and cannot be reached? Or will I just run out of gas? Any help would be appreciated.