CPR CREW DECLARED FUEL EMER AFTER ENCOUNTERING ATC AND ALT RERTES WHILE FLYING INTO AN AREA OF BELOW MINIMUMS WX.

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UNEXPECTED CRUISING ALT; ROUTING; VECTORS; AND WX; CMH TO FRG NOV/THU/01. THESE FACTORS LED TO A MINIMUM FUEL SIT; TO BE FOLLOWED BY DECLARING A MINIMUM FUEL EMER; AND REQUEST FOR ATC PRIORITY FOR AN APCH. THE PROB BEGAN WHEN WE DID NOT RECEIVE OUR REQUESTED CRUISING ALT OF FL330; DUE TO EBOUND TFC INTO THE EAST COAST. STAYING AT A FINAL ALT OF FL290 THAT RESULTED IN HIGHER FUEL BURNS. SECONDLY; UNEXPECTED ROUTING CHANGE THAT TOOK US OFF OUR NORMAL ROUTING; AND SENT US TO FRG VIA A NORTHERN RTE. THIS ADDED NEARLY 50 MINS TO PLANNED ENRTE TIME; AS WELL AS A FURTHER LOWER ALT RESTRS FOR THE LAST HR OF THE FLT. ONCE AGAIN CAUSING HIGHER FUEL BURNS AS WELL. ONCE WE OBTAINED THE ATIS INFO AT FRG; AND IT WAS BELOW MINIMUMS FOR THE APCH; WE DECIDED THAT ISP WOULD BE A BETTER OPTION CONSIDERING OUR FUEL SIT. WHILE GETTING VECTORED FOR THE APCH; WE WERE AGAIN ASSIGNED A LOWER ALT; THUS HIGHER FUEL BURNS. NEARING ISP; THE ARPT WENT BELOW MINIMUMS FOR THE APCH. AT THIS TIME WE OPTED FOR TEB; AFTER COMPLYING WITH ATC INSTRUCTION; AND AN ADDITIONAL RERTE TO TEB. WE BEGAN WORKING ON AN ALTERNATE PLAN IF TEB DID NOT WORK OUT. LOWER ALT WAS GIVEN BY ATC DUE TO TFC WHILE BEING VECTORED FOR THE APCH. ATC PULLED US OFF THE APCH BECAUSE TEB WENT BELOW WX MINIMUMS. AT THIS TIME WE DECLARED MINIMUM FUEL; AND NOT AN EMER; WE REQUESTED VECTORS FOR AN ILS INTO HPN; AFTER A HIGH TURN ONTO FINAL INTO HPN; ATC ONCE AGAIN PULLED US OFF THE APCH; DUE TO OUR ALT AT THE OM; AS WELL AS INTERCEPT ANGLE. KNOWING THE ADDITIONAL RERTES AND ALT CHANGES WERE NOT AN OPTION; WE DECLARED A MINIMUM FUEL EMER; AND REQUESTED FIRST PRIORITY ON THE ILS TO HPN; LNDG SAFELY. KNOWING THE ADDITIONAL RERTES AND ALT CHANGES WERE NOT AN OPTION; WE DECLARED A MINIMUM FUEL EMER; AND REQUESTED FIRST PRIORITY ON THE ILS TO HPN. UNEXPECTED CRUISING ALT ROUTING; VECTORS; AND WX; WERE ALL CONTRIBUTING FACTORS. MY THOUGHTS ON THIS MATTER ARE THAT THE DECISION TO DECLARE MINIMUM FUEL EMER WAS THE PROPER JUDGEMENT CALL TO MAKE. WE LANDED SAFELY WITHOUT INCIDENT. IN THE EVENT THE DECISION WAS NOT MADE THE RESULT WOULD HAVE BEEN EXHAUSTING THE ACFT OF FUEL; FORCED LNDG; AND POSSIBLE LOSS OF LIFE.