FLT CREW OF A319 RECEIVED FINAL WT MANIFEST WITH TOG 16000 LBS LESS THAN ORIGINALLY PLANNED.

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THE MANIFEST RECEIVED IDENTED A TKOF WT THAT WAS APPROX 16000 LBS LESS THAN THE PLANNED TKOF WT. WE WERE ON A TIGHT WHEELS UP TIME FOR FLOW CTL. THE CAPT MONITORED ATC ON THE TAXI AS I CALLED OPS TO RESOLVE THE DISCREPANCY PER SOP. I TOLD OPS PERSONNEL THAT WE HAD A FULL ACFT; 120 PAX AND WE WANTED TO RECONFIRM OUR TKOF WTS; BECAUSE WE DIDN'T UNDERSTAND THE 16000 LB REDUCTION WITH A FULL ACFT. SHE STATED THAT OUR TKOF WTS WERE CORRECT AND THE REDUCTION WAS BECAUSE 120 BAGS AND OTHER CARGO WERE NOT XFERRED FROM THE CANCELLED FLT. I QUESTIONED AGAIN AND STATED WE HAD A FULL FLT; 120 PAX; HOW CAN THE WT DROP BY 16000 LBS. AGAIN SHE STATED THAT BECAUSE OF THE CARGO REDUCTION; THE WT WAS CORRECT. SO I ASKED HER IF THE TKOF WT WAS 118000 LBS AND SHE SAID YES. I TOLD THE CAPT THE WT WAS CORRECT AND WAS THE RESULT OF THE CARGO REDUCTION AND ENTERED THE REDUCED WTS. AS WE WERE APCHING FOR DEP; THE CAPT QUESTIONED THE WTS AGAIN. AFTER A DISCUSSION; WE DECIDED TO BE CONSERVATIVE AND ASSUMED THE ACFT WAS AT THE HEAVIER WT FROM THE MANIFEST WITH FULL PAX AND USE THE APPROPRIATE HIGHER V-SPDS. IT WAS A TOGA TKOF FOR RWY AT DCA WITH THE MTOG AT 135800 LBS AND THE HEAVIER WT MANIFEST WAS INDICATING TOG OF APPROX 134000 LBS. THESE WERE THE WTS WE USED RATHER THAN THE 118000 TOG MANIFEST WE RECEIVED FROM LOAD PLANNING. WE FELT THIS WAS A SAFE COURSE OF ACTION AND DIDN'T FEEL IT WAS NECESSARY TO CANCEL OUR TKOF TO GO BACK TO OPS TO RESOLVE AN ISSUE THEY INDICATED WAS NO ISSUE. THE ACFT PERFORMANCE WAS NORMAL ON TKOF. AFTER DEP; WE BEGAN TO LOOK FURTHER INTO THIS FINAL WT MANIFEST THAT WAS IN ERROR AND NOTICED THE PAX COUNT WAS 020 RATHER THAN 120. ON THE GND; I INITIALLY NOTICED THE LARGE DISCREPANCY IN THE ZFW AND IT CAUGHT MY ATTN. UPON EXAMINING THE REST OF THE WT MANIFEST; I DIDN'T NOTICE THAT THE PAX COUNT READ '020' INSTEAD OF '120;' AS I USUALLY SEE IT OFF BY NO MORE THAN A COUPLE OF DIGITS. I SAW THE '020' AND IT REGISTERED AS '120;' SINCE THAT IS WHAT I EXPECTED TO SEE. AT THAT HR OF THE EVENING AND FEELING RUSHED; I DIDN'T ATTRIBUTE THE LARGE WT DIFFERENTIAL TO A POSSIBLE PAX DISCREPANCY; SO I DIDN'T RECONFIRM THE PAX COUNT. HAD I DONE THAT; THE DISCREPANCY WOULD HAVE BEEN RESOLVED AND CLRED UP PRIOR TO TKOF. WE FOCUSED ON THE WT DROP AND CALLED TO CONFIRM PAX LOAD AND CORRECT WTS WITH OPS AND NEVER LINKED THIS ERROR IN THE WT WITH THE ERROR IN THE PAX COUNT. APPARENTLY; NEITHER DID OPS; AS THEY WERE ADAMANT THE REDUCED WT WAS BECAUSE OF THE CARGO REDUCTION AND DIDN'T UPDATE THE NUMBERS OR SEND US A NEW MANIFEST WHEN WE GAVE THEM OUR; ACTUAL PAX COUNT TWICE. WE COULDN'T EASILY VERIFY OPS ASSERTION THE REDUCED TOG WAS FOR CARGO REDUCTION; AS THE FINAL WT MANIFEST DOES NOT BREAK OUT CARGO WTS. WE CONFIRMED; IN FACT WE USED; THE CORRECT WTS FOR DEP WITH DISPATCH AND OPS ENRTE TO ASSURE WE HAD THE CORRECT WTS FOR LNDG. IN RETROSPECT; WE SHOULD HAVE STOPPED THE DEP TO RESOLVE THE ISSUE OF THE REDUCED WT. APPARENTLY; EARLY ON IN THE LOADING OF THE ACFT; LOAD PLANNING MADE A PAX ENTRY ERROR BUT CORRECTED WITH THE CORRECT PAX COUNT AND WE SHOULD HAVE RECEIVED THE CORRECTED COPY. CONTRIBUTING ISSUES INCLUDED: THE TIME COMPRESSION OF SHORT TAXI TO RWY; WHEELS UP RESTRS AND FLT ATTENDANTS HAD 30 MINS REMAINING BEFORE GOING ILLEGAL FOR THE FLT BECAUSE OF DUTY TIME. HIGH WORKLOAD AT DCA OPS. FATIGUE OF A LONG DUTY DAY FOR ALL INVOLVED. THE BOTTOM LINE IS THE TKOF WAS NORMAL WITH THE CORRECT WTS AND PERFORMANCE; BUT THE PROCESS TO GET THERE WAS LESS THAN DESIRABLE.