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So, ever since I got this truck a month ago, I have been scratching my head about my fuel tank size..... when I bought it it was empty. light on and it took 20 gallons to fill up... ever since its the same.... I took a 400 mile trip to Disneyland this week and sure enough, when it was empty I filled it up........ light on and computer saying I had 35 mile range..... took 20.9 gallons to fill up....... my odometer read 345 miles and the computer said I used 20.3 gallons..... I hand calculated 16.5 miles per gallon.... spot on to the computer average. I drove most of the way in cruise set at 78mph....... so is it possible to have a 23-24 gallon tank......
after numerous empty re-fills it never takes more than 21 gallons to fill it up......