EMB145 CREW RPTS HIGHLY OPTIMISTIC FUEL CALCULATIONS BY COMPANY DISPATCHER WHILE HOLDING.

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KORRY 3 ARR TO LGA. ASSIGNED HOLDING AT HOLEY. ENTERED HOLDING XA03Z WITH EFC XA35Z. CONTACTED DISPATCH TO ADVISE OF HOLDING. DISPATCH 'RAN THE NUMBERS' AND RPTED ENRTE FUEL FROM HOLEY TO LGA OF 271 LBS; 1900 LBS RESERVE; MINIMUM FUEL TO DEPART HOLEY FOR LGA OF 2171 LBS. WITH ALL DUE RESPECT; AN EMB145 CANNOT GO 60 MI ON 271 LBS OF FUEL UNLESS IT IS IN A STEEP DSCNT OR A HELLACIOUS TAILWIND. I ASKED DISPATCH TO REPEAT THE ENRTE BURN AND THEY REPEATED 271 LBS. FO AND I DISCUSSED THIS AND DETERMINED WE WOULD LEAVE THE HOLD EITHER FOR LGA OR FOR A DIVERT FIELD AT 2600 LBS. WE WERE RELEASED FROM THE HOLD AT APPROX XA20Z AND FLEW TO LGA AND LANDED WITHOUT FURTHER DELAY. ACTUAL ENRTE BURN FROM HOLEY TO LNDG WAS MONITORED BY US AND WAS 650 LBS. FUEL ON BOARD AT LNDG WAS 3100 LBS. HAD WE RELIED ON THE OBVIOUSLY LOWBALL ENRTE BURN GIVEN BY DISPATCH; AND HAD WE LEFT THE HOLD AT THE ISSUED MINIMUM FUEL OF 2171 LBS; WE WOULD HAVE LANDED WITH LESS THAN 1600 LBS OF FUEL. WHILE THE RESERVE IS THERE TO BE USED IF NEEDED; PLANNING CANNOT PROVIDE FOR LESS THAN THE 45 MINS. AGAIN; WITH ALL DUE RESPECT; THE CALCULATED FUEL BURNS ARE IN THE OPS MANUAL AND I FEEL THAT HAD WE RELIED ON THE FIGURE GIVEN TO US BY DISPATCH AND A DELAY HAD RESULTED IN A FUEL EMER; WE AS THE CREW WOULD HAVE BEEN CRUCIFIED.