B767-300ER FO INADVERTENTLY FORGOT THE FUEL LOAD WHEN CALCULATING THE TKOF SPD RESULTING IN A TAIL STRIKE DUE TO THE SLOWER ROTATION SPD RESULTING IN A HIGHER PITCH ATTITUDE DURING LIFTOFF.

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I WAS FO OF A FLT. THE ACFT WAS CREWED WITH A RELIEF OFFICER DUE TO ITS DURATION GREATER THAN 8 HRS. ON PREFLT OF THE FMC; I RECEIVED THE WT AND BAL AND LOADED THE ZERO FUEL WT INTO THE FMC. DUE TO THE ACFT NOT BEING FUELED YET; THE WT (TOTAL GROSS) CAME IN AT 300000 LBS. DUE TO MY HABIT PATTERN; I IMMEDIATELY OPENED THE SPD CARD TO THE 300000 LBS PAGE AND BEGAN TO REVIEW THE DATA. I THEN REALIZED A DERATED THRUST TKOF WAS POSSIBLE; AND KNEW SOMETHING WAS NOT RIGHT; AS I'VE NEVER BEEN ABLE TO USE DERATED THRUST WHEN THE FLT IS TO CROSS AN OCEAN. I THEN REALIZED THE FUEL HAD NOT BEEN UPLOADED; AND WENT ABOUT DOING OTHER COCKPIT PREFLT DUTIES. AFTER WE RECEIVED THE FUEL SLIP; THE DOOR WAS CLOSED AND WE BLOCKED OUT PERFORMING ALL APPROPRIATE CHKLISTS. HOWEVER; I NEVER REVISITED THE SPD CARD; AS MY HABIT PATTERN WAS TO OPEN IT TO THE CORRECT PAGE UPON LOADING THE ZERO FUEL WT INTO THE FMC. TKOF ROLL WAS NORMAL; WITH THE EXCEPTION OF A ROTATE SPD 25 KTS SLOW DUE TO THE INCORRECT SPDS USED. I NOTICED NO VIBRATION AT LIFTOFF; AND DEP WAS UNEVENTFUL. HOWEVER; A HIGHER THAN NORMAL DECK ANGLE WAS NOTED; ALONG WITH A 'SLOW' INDICATION IN THE HSI. CAPT; RELIEF OFFICER; AND I REALIZED WHAT HAPPENED ON CLBOUT. THE FLT WAS UNEVENTFUL FOLLOWING CLBOUT. FACTORS THAT CONTRIBUTED TO THIS EVENT WERE THE 'BREAKING' OF MY NORMAL HABIT PATTERNS. I HAVE NEVER HAD THE ACFT FUELED AFTER IT WAS LOADED; THUS MY OPENING THE SPD CARD TO THE INCORRECT PAGE WAS DUE TO THE FMC BEING AN ACCURATE INDICATION OF ACTUAL WT. SUPPLEMENTAL INFO FROM ACN 519548: AFTER ALL CHKLISTS WERE COMPLETE; THE FLT WAS CLRED FOR TKOF ON RWY 26R. TKOF ROLL WAS NORMAL UNTIL ROTATION WHERE THE CAPT NOTED HIGHER THAN NORMAL PULL FORCES ON THE YOKE AT ROTATION. THE ACFT WAS FLOWN FROM THE RWY AT APPROX V2 + 10 KTS. NONE OF THE CREW DETECTED THE TAILSKID STRIKE NOR WERE ANY INDICATIONS GIVEN BY THE ACFT WARNING SYS. THE FLT WAS COMPLETED WITHOUT FURTHER INCIDENT. DUE TO THE HIGHER THAN NORMAL ANGLE OF ATTACK ON TKOF AND CLBOUT THE TAILSKID WAS INSPECTED ON POSTFLT. SCRAPES WERE NOTED ON THE SKID SHOE AND RPTED TO MAINT. REQUIRED MAINT INSPECTIONS WERE PERFORMED WITH NO DAMAGE NOTED; OTHER THAN SCRAPES ON THE SKID SHOE; AND THE ACFT WAS RETURNED TO SVC.