A BE20 CREW; ON APCH TO TZV; MADE AN EMER LNDG IN A FIELD 10 MI SHORT OF DEST.

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PRIOR TO DEP I ADVISED THE CAPT ON HOW MUCH FUEL WOULD BE NEEDED TO COMPLETE THIS LEG. AFTER DISCUSSING THIS WITH THE CAPT IT WAS ASSURED TO ME THAT THE AMOUNT OF FUEL ONBOARD WOULD BE SUFFICIENT. I QUESTIONED THE CAPT ONE MORE TIME AND THE CAPT ASSURED ME IT WOULD BE ENOUGH. ONCE ENRTE TO OUR DEST I ADVISED THE CAPT THAT WE SHOULD STOP AT AN ALTERNATE FIELD FOR MORE FUEL. THE CAPT ONCE AGAIN ASSURED ME THE REMAINING FUEL WOULD BE ADEQUATE. ULTIMATELY; MY SUGGESTIONS TO THE CAPT WERE IGNORED AND THE FLT WAS CONTINUED TO THE DEST. DURING THE FLT WE WERE CRUISING AT FL180. APPROX 70 MI TO OUR DEST WE STARTED TO DSND. WITH APPROX 45 MI OUT FROM OUR DEST DSNDING THROUGH AN APPROX ALT OF 7000 FT MSL THE L ENG CEASED; FOLLOWED BY THE R ENG. AFTER SAFELY LNDG IN A FIELD; WITHOUT ACCIDENT; WE CONCLUDED THAT IT MIGHT BE A POSSIBLE FUEL STARVATION. HOWEVER; THE FUEL GAUGES WERE INDICATING THAT THERE WAS STILL FUEL IN THE TANKS. PRIOR TO THE FLT; REALIZING THAT THE CAPT WOULD NOT TAKE MY ADVICE ABOUT ADDING FUEL; I SHOULD HAVE NOT BOARDED THE ACFT. OTHER CONTRIBUTING FACTORS WERE STRONG HEADWINDS AND CRUISING AT A LOWER ALT.