AN SMT PLT GOT A PARTIAL LOAD OF JET FUEL IN HIS PISTON ENG ACFT.

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I FLEW A PISTON SMT FROM TULSA INTL ARPT TO PARAGOULD MUNICIPAL (PGR); AZ. I HAD TAXIED THE AIRPLANE TO THE REFUELING AREA. AS I EXITED THE AIRPLANE; I ASKED HIM TO 'TOP OFF THE TANKS; BOTH THE TIPS AND AUX'S.' I THEN WENT INTO THE BUILDING WITH THE CUSTOMER TO WAIT FOR THE REFUELING PROCESS SO I COULD PAY AND LEAVE. AFTER REFUELING THE AIRPLANE; THE ATTENDANT CAME INTO THE BUILDING; WROTE OUT THE TICKET. I CHKED THE TOTAL AND SIGNED IT. I RETURNED TO THE ARPT THAT NIGHT AT XL00; PREFLTED THE ACFT; TOOK OFF AND WAS APPROX 50 MINS INTO THE FLT WHEN I SWITCHED THE TANKS TO THE AUX TANKS. WITHIN 10 SECONDS OF SWITCHING THE TANKS; THE ENGS BEGAN TO LOSE PWR. MANIFOLD PRESSURE BEGAN TO DROP. I IMMEDIATELY SWITCHED BACK TO THE TIPS AND WATCHED THE TEMP GAUGES. THE L ENG; WHICH RUNS AT APPROX 370 DEGS; WENT TO 410 DEGS AND THE R ENG; WHICH RUNS AT ABOUT 340 DEGS; WENT TO APPROX 380 DEGS. I IMMEDIATELY DECIDED THAT I WOULD LAND AT DRAKE FIELD (THEY HAVE AN OPERATING TWR). THE ENG TEMPS (CYLINDER HEAD) RETURNED TO NORMAL WITHIN 2 MINS. BECAUSE OF THIS; I DID NOT DECLARE AN EMER AND LANDED UNEVENTFULLY. TOGETHER THE GND ATTENDANT AND I BEGAN TO SUMP THE FUEL TANKS. AFTER A PINT OF SUMP WE WERE ABLE TO 'DETERMINE' THAT THE AUX TANKS WERE FULL OF JET-A AND THE TIPS WERE 100LL. I CALLED BACK TO THE OWNER AND EXPLAINED THAT SOMEHOW THE ATTENDANT AT PARAGOULD HAD FILLED THE AUX'S WITH JET-A; BUT THE TIPS WERE FULL OF 100LL. I EXPLAINED THE FLT AND DETERMINED TO TOP THE TIPS WITH 100LL GIVING A 2 1/2 HR FLT TIME FOR A 20 MIN FERRY FLT BACK TO TUL WITH THE AUX TANKS ISOLATED. AFTER A 15 MIN RUN-UP AT THE END OF THE RWY; I COMPLETED AN UNEVENTFUL FERRY FLT TO TULSA IAP. LESSONS LEARNED: THE ATTENDANT AT PARAGOULD WAS VERY NEW (LESS THAN 2 WKS). HIS TRAINING WAS OBVIOUSLY LACKING AS IT IS APPARENT HE KNEW HE WAS PUTTING JET-A INTO A PISTON SMT. THE REFUELING NOZZLE AT PARAGOULD DID NOT HAVE THE REQUIRED JET-A NOZZLE AND; AS A RESULT; THE ATTENDANT WAS ABLE TO GET FUEL INTO THE SMT; EVEN THOUGH THE SMT WAS MARKED 100LL ONLY AND HAD THE RESTRICTORS ON THE REFUELING OPENINGS. I MISSED THAT HE HAD INDEED WRITTEN JET-A ON THE REFUELING TICKET BECAUSE NOTHING WAS APPARENTLY WRONG WITH THE TOTAL. THE DOLLAR/GALLON IS THE SAME AT PARAGOULD FOR JET-A AND 100LL. I CHKED THE TOTAL DOLLARS AND IT APPEARED NORMAL. IT NEVER OCCURRED TO ME TO CHK THE FUEL TYPE.