THE ACFT CRASHED INTO TREES AND AFTER A LOSS OF POWER DURING FINAL APCH. PLT REPORTED THE ACFT HAD 70 GALLONS OF AVGAS ONBOARD AT DEPARTURE FROM CONWAY, SC, AT 0900 EDT. THE PROPOSED FLT FROM CONWAY TO FLORENCE, SC, AND BACK TO CONWAY WAS A DISTANCE OF 72 NM. DURING THE APCH ON THE RETURN TO CONWAY, THE PLT REPORTED THAT SHE REDUCED POWER TO 13' HG MANIFOLDPRESSURE AND SLOWED THE ACFT TO 120 KTS AT AN ALT OF 850 FT. FLAPS WERE LOWERED TO 10 DEGREES AND THE PLT REPORTEDLY WASGOING TO ADD POWER. FULL THROTTLE WAS REPORTEDLY APPLIED BUT THE POWER WENT TO IDLE. A TURN TO FINAL WAS IMMEDIATELY MADE AND BEST GLIDE WAS SAID TO HAVE BEEN ESTABLISHED. UPON REALIZING THAT THE RWY WAS NOT GOING TO BE REACHED, THE SWITCHES AND MIXTURE WERE CUT. POST ACCIDENT CHECKS VERIFIED FUEL LINE CONTINUITY. APRX 2 OUNCES OF FUEL WERE DRAINED FROM THE LEFT FUSELAGE HEADER TANK AND APRX 32 OUNCES FROM THE RIGHT. THE FUEL TANK SELECTOR WAS POSITIONED ON THE LEFT TANK. ENGINE RUN-UP DISCLOSED NO DISCREPANCIES.