C150 PLT MAKES AN OFF FIELD LNDG DUE TO FUEL EXHAUSTION.

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A CLOUD LAYER FORMED BELOW ME THAT WAS SCATTERED AT 1000 FT. I WAS FLYING VORS TO VERIFY MY POS AS WELL AS USING PILOTAGE AND DEAD RECKONING. UPON REACHING ZZZ AIRSPACE I COULD NOT REACH ZZZ APCH. I WAS XMITTING AND NOT RECEIVING. NOT WANTING TO FLY INTO CLASS C AIRSPACE; I TURNED N UNTIL I WAS N OF THE AIRSPACE THEN TURNED E UNTIL I INTERCEPTED THE ZZZ 020 DEG RADIAL AND FLEW IT IN DSNDING TO 2000 FT (ROUGHLY). I PICKED UP SOME RAIN AND HAD A TOUGH TIME MAKING THE ARPT. THE ZZZ VOR HAD FLIPPED AND IT WAS OBVIOUS I HAD MISSED THE ARPT. I TURNED AROUND AND FLEW N. I EXPERIENCED SOME ENG ROUGHNESS. I KNEW I WAS LOW ON GAS AND WASN'T SURE ABOUT MAKING THE RWY. I CIRCLED AN EMPTY FIELD AND THEN MY ENG BEGAN SPUTTERING. IT WAS APPARENT IT WASN'T GOING ANY FURTHER. I TURNED INTO THE WIND AND LANDED IN A CORN FIELD WITH THE ROWS AS CLOSE TO THE ROAD AS I THOUGHT WAS SAFE. IT WAS A NICE LNDG IN A VERY MUDDY FIELD. THERE WAS NO APPARENT DAMAGE TO THE ACFT. THE POLICE AND FIRE CREWS SHOWED UP VERY SHORTLY. ULTIMATELY; I FEEL THE PROB AROSE FROM A NUMBER OF CONTRIBUTING FACTORS. FIRST OF ALL; THERE WERE STORMS THAT WERE SLOWER MOVING THAN I HAD PLANNED AND THE WX MADE IT MORE DIFFICULT TO NAV. I ALSO ENCOUNTERED INTERMITTENT RAIN ALONG THE RTE WHICH HAD CAUSED ME TO USE A LOT OF CARB HEAT AND RUN THE ENG MIXTURE RICHER THAN I FIRST HAD PLANNED. BOTH OF THESE FACTORS CAUSED ME TO BURN MORE FUEL THAN ANTICIPATED; AND I FLEW A LONGER RTE THAN EXPECTED. I ALSO KNEW I WAS LOW ON GAS AND LET IT FALL TOO FAR BELOW BEFORE CONSIDERING MYSELF IN AN EMER STATE. ALSO THE GAS TANKS INDICATED ABOUT 1/8 - 1/4 TANK IN EACH. I DEPENDED ON THEM ENTIRELY TOO MUCH. I WAS HOPING TO BE BACK HOME THAT NIGHT AND IT RUSHED MY DECISION TO LEAVE.