FLC PLTDEV NON ADHERENCE TO ATC CLRNC INSTRUCTION.

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WE HAD ALL ENGS STARTED; NEXT FOR TKOF ON 26L ATL. TWR SAID WE HAD AN 8 MIN DELAY FOR RELEASE TO ORD; SO TAXI DOWN 26L TO THE FIRST R TURN; TAXI UP TO AND HOLD SHORT 26R. THE CAPT CONCENTRATED ON SAVING FUEL AND SHUT DOWN ENG 3 AS WE TAXIED ACROSS 26L; POSSIBLY 'GNDING' (COPYING) AN MLG WE WATCHED DO THE SAME THING THE DAY BEFORE. THE SO AND MYSELF KNEW WE WERE TO GO DOWN 26L; NOT ACROSS; BUT ANTICIPATED THE USUAL WIDE TURN ONTO IT. WHEN THE ACFT MOVED THE ADDITIONAL 20 FT OR SO TO GO STRAIGHT INSTEAD OF TURNING; WE WERE COMMITTED WITH THE NOSEWHEEL AND HAD TO CONTINUE STRAIGHT. TWR WAS BUSY INSTRUCTING OTHER ACFT INCLUDING 2 OTHERS TO LAND ON 26R. TWR EVENTUALLY ACKNOWLEDGED OUR SITUATION AND STOPPED US IN POS UNTIL 26R TFC HAD ALL LANDED. WE HAD ONLY PROCEEDED TO START AND TURN W ON THE TAXIWAY; AND NEVER ENCROACHED ON ANY RWYS. CONTRIBUTING -- THIS WAS THE LAST DAY OF A 4 DAY TRIP -- SOMEWHAT TIRED -- ALL DISTRACTED DURING INITIAL TAXI SHUTTING DOWN 1 ENG. -- POSSIBLE 'GNDING' BY THE CAPT ON THE TAXI RTE AN MLG WE WATCHED THE DAY BEFORE WHO DID GO THE WAY WE WENT TODAY.