BE1900 FLC ASSUMES FUEL FOR FLT AND CHKS FUEL AFTER 50 MI FROM DEP STATION. DIVERTS FOR FUEL.

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AS MY CREW WAS FLYING INTO DENVER FROM PUEBLO; I ASKED HOW MANY PAX AND MINIMUM FUEL REQUIRED FOR FLT XXX TO RIW-WRL. I WAS TOLD 9 PEOPLE AND 1700 LBS FUEL FOR MINIMUM. WITH OUR AIRPLANE WE CAN TOP THE OUTBOARDS WITH LESS THAN 13 PEOPLE AND STILL BE UNDER GROSS WT. I PUT IN A FUEL ORDER FOR THE NEXT FLT IN THE AIR (SOP) TOPPING OUTBOARDS. AFTER GETTING ON THE GND AND GETTING MY PAPERWORK FOR THE NEXT FLT; I PROCEEDED OUT TO THE ACFT TO DEPART. I ASKED THE FO IF WE GOT FUELED AND HE ACKNOWLEDGED YES. THE TKOF AND CLB WERE UNEVENTFUL UNTIL I GLANCED OVER AT THE FUEL GAUGES AFTER TKOF. I SAW ONLY ABOUT 1500 LBS ON BOARD. AFTER DETERMINING THAT WE DEPARTED WITH JUST ENOUGH MINIMUM FUEL; I CONTINUED. AFTER DETERMINING THAT THE WINDS ALOFT WERE SHOWING A LESS HEADWIND THAN WHAT WAS ACTUALLY SHOWN; I DECIDED TO MAKE A LNDG AT LARAMIE TO GET MORE FUEL DUE TO THE INCREASED HEADWINDS SHOWN. THE REST OF THE NIGHT WAS UNEVENTFUL. I BELIEVE THAT FUTURE PROBS LIKE THIS COULD BE SOLVED IF WHEN GOING OVER FUEL QUANTITY IN OUR CHKLIST IT SHOULD BE CHALLENGE RESPONSE VERSUS VERBAL RESPONSE SO THAT BOTH CREW MEMBERS ACKNOWLEDGE FUEL AND MINIMUM NEEDED.