SINGLE PLT GA SMT CONDUCTED SINGLE ENGINE CLIMB AND CRUISE WITHOUT NOTIFYING ATC. POOR ACFT PERFORMANCE CAUSED ATC TO REPORT FLT VARIATION TO LOCAL GADO FOR INVESTIGATION.

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I DEPARTED BWI TO FERRY THE ACFT (EMPTY PART 91) TO THE COMPANY HUB IN COLUMBUS; OH. I USED THE OPPORTUNITY TO PRACTICE SINGLE ENG OPS AS THERE WAS VERY LITTLE IF ANY TFC AT THAT TIME IN THE MORNING. ON CLBOUT; I REDUCED PWR ON THE LEFT ENG AND SLOWLY CLBED OUT WITH THE GEAR DOWN TO STUDY THE PERFORMANCE (ACFT KNOWN FOR POOR SE PERFORMANCE). THE DEP CTLR ASKED IF I HAD A PROB. I INFORMED HIM THAT I HAD THE PWR REDUCED ON THE LEFT ENG AND WAS JUST FERRYING THE ACFT. (I DID NOT INFORM HIM THAT I WAS TRNING.) I DID SAY THAT THE PWR REDUCTION WAS NOT A PROB. I PRACTICED FUEL XFEEDING & TOOK NOTES OF THE DIFFERENT CONFIGNS AND PERFORMANCE (WORKING FOR A PART 135 OPERATION AND FLYING NIGHTLY SCHEDULED RUNS; THERE IS NOT MUCH OPPORTUNITY FOR SE TRNING. THIS AFFORDED AN EXCELLENT CHANCE TO TRAIN VFR; EMPTY AND IN NO RUSH). AFTER APPROX 45 MINS I INCREASED THE PWR ON THE LEFT ENG AND IT ONLY CAME UP TO 19' MP. (LATER FOUND TO BE A FRAYED THROTTLE CABLE HANGING UP IN A GROMET.) AS 18.20' MP IS LONG RANGE CRUISE ON THE SMT I SET 19' MP IN BOTH ENGS AND CONTINUED. I DID NOT FEEL IT WAS A GOOD IDEA TO RETURN TO BWI DURING THE AIRLINE RUSH. SHORTLY AFTER THIS THE CTLR REQUESTED A GOOD RATE CLB FOR TFC. I INFORMED HIM I WAS DOING THE BEST I COULD. HE THEN GAVE ME A VECTOR FOR THE TFC. AS THE WX WAS VERY VFR; AND EVERYTHING WORKING FINE AT LONG RANGE CRUISE; I CANCELLED IFR AND CONTINUED VFR TO COLUMBUS SO AS TO REDUCE CTLR WORKLOAD. AT COLUMBUS; I REQUESTED VFR VECTORS FOR A SE ILS APCH; SHUT DOWN THE LEFT ENG (FOR MORE PRACTICE) AND SHOT THE ILS APCH AND LNDG. I TAXIED OF THE RWY; STARTED UP THE LEFT ENG AND TAXIED INTO THE FBO. DUE TO A CALL FROM DULLES DEP; 2 MEMBERS OF THE COLUMBUS GADO MET ME AT THE ACFT WITH THE BELIEF THAT I WAS HEAVILY OVERLOADED. I WAS IN FACT EMPTY; DOING PRACTICE SE TRNING; AND FLYING AT LONG RANGE CRUISE. I HAVE BEEN INFORMED BY MY CHIEF PLT THAT THE GADO HAS TAKEN EXCEPTION TO MY ACTIONS BUT GADO WILL NOT DISCUSS IT WITH ME. PROBS: IF I HAD BETTER INFORMED THE CTLR OF MY TRNING ACTIONS; HE WOULD HAVE BEEN LESS CONCERNED. IF THE CTLR HAD QUESTIONED HAD MY ACTIONS A LITTLE MORE INSTEAD OF MAKING FALSE CONCLUSIONS; HE WOULD HAVE BEEN LESS CONCERNED. IF THE GADO WOULD TAKE MORE TIME TO DISCUSS PROBS WITH PLTS; INSTEAD OF JUMPING TO LEGAL ACTIONS. THE PLTS WOULD BE BETTER INFORMED WITH LESS ANIMOSITY TO THE FAA.