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useable fuel

  1. Remaining fuel calculation

    Electrical & Computer Systems
    Have 2016 Crewmax Ltd with 38 Gal fuel tank. Low fuel illuminates when puter sez 30-36 miles remain (til burnout?). Yet, at most I have been able to pump is 29.5 gallons of gas. Is computer miscalculating or do I have 8-9 gal of unusable fuel. Or does my 38 gal tank only really hold 32-33 gal...