A BE1900 CAPT FOLLOWED A FLT PLAN AS FILED; RATHER THAN AS WHAT WAS RECEIVED.

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THE PROB AROSE WHILE ON AN IFR FLT FROM DEN TO RKS. WE WERE FILED FROM LAR TO CKW TO OCS. WE WERE THEN CLRED LAR DIRECT OCS BUT PROCEEDED TO FLY LAR-CKW-OCS; AS FILED. CONTRIBUTING FACTORS WERE A LACK OF DILIGENCE ON THE CAPT'S PART IN CHKING THE CLRNC AND A DIFFERENT RTE THAN WE USUALLY TAKE TO RKS. WE SHOULD HAVE BEEN MORE ALERT TO POSSIBLE LCL PREFERENCES IN RTE SELECTION/CLRNC. THE PROB WAS DISCOVERED WHEN WE WERE QUERIED BY ZDV AS TO HOW WE WERE CLRED WHEN LEAVING DEN. WE DISCOVERED THE PROB AND TURNED APPROX 10 DEGS L AND PROCEEDED DIRECT TO OCS VOR. CTR DID NOT INDICATE THAT THERE WAS ANY PROB WITH CONFLICTING TFC; ONLY THAT HE WANTED TO MAKE SURE ACFT WERE BEING CLRED AS DESIRED WHEN IN DEN. I DON'T THINK WE WERE MORE THAN A COUPLE MI OFF COURSE AT THE MOST. TO PREVENT A RECURRENCE I; AS CAPT; HAVE BEGUN QUESTIONING THE ACTUAL WORDING OF THE CLRNC; BEFORE EVERY FLT; OF MY FO'S; WHO USUALLY TAKES DOWN THE CLRNC. I MAKE SURE TO DO THIS BEFORE EVERY FLT TO KEEP FROM GETTING COMPLACENT WHEN RECEIVING THE SAME ROUTING ALMOST EVERY TIME.