NTSB Probable Cause

FUEL EXHAUSTION PRECIPATATED BY THE INADEQUATE FUEL CONSUMPTION CALCULATIONS PERFORMED BY THE PILOT, PRESSURE FROM THE COMPANY PRESIDENT TO NOT CARRY EXCESS FUEL AND IMPROPER IN-FLIGHT PLANNING/DECISIONS BY THE PILOT BY NOT REFUELING ENROUTE BEFORE FUEL WAS EXHAUSTED. CONTRIBUTING TO THE ACCIDENT WAS THE INADEQUATE SURVEILLANCE AND CERTIFICATION OF THE OPERATOR BY THE FAA.