A C150 PLT REPEATEDLY PROVED; DURING 4 DIFFERENT FLTS OVER A PERIOD OF 2 DAYS; THAT HE DID NOT KNOW HOW TO PROPERLY AND SAFELY DEVELOP A FLT PLAN.

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I ARRIVED AT JNX ARPT AT APPROX XA30. I REQUESTED A TOP-OFF OF THE ACFT WHILE PREFLT WAS BEING CONDUCTED. I WAS AWARE THE ACFT HAD BEEN SITTING FOR SOME TIME; ALTHOUGH A RECENT ANNUAL INSPECTION WAS CONDUCTED. AFTER PREFLT WAS COMPLETE; I STARTED THE ACFT AND PROCEEDED TO THE RUNUP AREA. IN THE RUNUP AREA; I ESTABLISHED THE MIKE WAS NOT OPERATING WELL. I RETURNED TO RAMP AND SWITCHED FOR ANOTHER. I RETURNED TO RUNUP AND PROCEEDED WITH RUNUP AND TEST OF ACFT. EVERYTHING WAS OK; SO I WENT ON MY WAY. A DIRECT TRIP TO SAV; 248 NM AWAY; AT 2500 FT AT 70% PWR. ACCORDING TO THE FLT PLAN CALCULATIONS; THE TRIP WOULD HAVE TAKEN 2 HRS 50 MINS. AT APPROX 2 HRS 30 MINS INTO THE FLT; THE ENG STARTED TO LOSE PWR AND AN EMER LNDG WAS ACCOMPLISHED IN A STREET IN RIDGELAND; SC. NO DAMAGE TO PERSONS OR PROPERTY OR ACFT WAS CAUSED. ACFT WAS TOWED TO RIDGELAND FIELD AND TOPPED OFF WITH 24 GALLONS; CLRLY ESTABLISHING I RAN OUT OF FUEL. ONCE TOPPED OFF AT 3JI; I CAREFULLY INSPECTED ACFT FOR LEAKS AND MECHANICAL PROBS AND NONE WERE FOUND. AFTER A LONG RUNUP AND TEST TKOF RUN; I ESTABLISHED THE ACFT WAS SAFE FOR FLT AND DEPARTED FOR SAV. FROM 3JI TO SAV; A 24 NM TRIP; AND .4 HOBBS; THE ACFT WAS TOPPED OFF AGAIN WITH 5 GALLONS; CLRLY SHOWING A HIGH FUEL BURN. I DECIDED TO SPEND THE NIGHT AND IN THE MORNING PLANNED A 1 HR TRIP TO JAX AND FOLLOW CLOSELY THE FUEL BURN. AFTER CAREFUL PLANNING CONSIDERING THE WIND; I AGAIN DEPARTED TO JAX; CLOSELY MONITORING GND SPD WITH MY GPS. THE TRIP TO JAX TOOK 1.2 ON HOBBS AND AGAIN; WHEN ACFT WAS TOPPED OFF; IT TOOK 11 GALLONS. ACCORDING TO THE CRUISE PERFORMANCE CHART; A BURN FOR CONDITIONS WAS TO BE AT 5.1 GALLONS PER HR. I RE-PLANNED A TRIP FOR 1 HR TO DAB; COMPLETED FLT PLANNING; AND DEPARTED FOR DAB 85 NM AWAY. AT AN AVERAGE OF 89 KTS GND SPD; I ARRIVED IN DAB IN 1.0 HOBBS. I TOPPED OFF ACFT AGAIN AND THIS TIME IT TOOK 9.4 GALLONS; CLRLY SHOWING A HIGH FUEL BURN. ALL ALONG THE TRIP I WAS IN CONTACT WITH THE ACFT OWNER; AN A&P AND AN INSPECTION A&P.