my 2008 f250 diesel the display says i have "x' amount of miles before empty, x meaning single digits. However when i fill up it only takes 17 gallons. i believe the tank is a 30 gallon. Why?

Asked by GuruNX2TD Oct 23, 2019 at 04:30 PM about the Ford F-250

Question type: Maintenance & Repair

when i fill up it says anywhere from 400 to 500 mile to empty and I only get half of that. it also says I get 18.5 mpg but I calculated 13.5

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