PA30; TWIN COMANCHE PLT TAXIES ACROSS PARALLEL RWYS WHEN CLRED TO RAMP AREA.

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WE CONTACTED MANASSAS TWR AND WERE CLRED TO ENTER A DOWNWIND PATTERN WITH L TURNS TO RWY 34L. WE WERE CLRED TO LAND ON RWY 34L AND TO THE W PARKING AREA. WE EXITED THE RWY AT THE END; TURNING L ON TXWY A. WE STOPPED BEYOND TXWY TURNOFF T2; CALLED GND CTL AND ASKED FOR CLRNC TO THE PARKING AREA OF THE COMANCHES ON THE E RAMP. THE CTLR WAS UNAWARE OF ANY PARKING AREA FOR COMANCHES; BUT CLRED US TO THE E RAMP. WE TAXIED TO TURNOFF TXWY A1 AND TURNED 180 DEGS AND CONTINUED TO TAXI N AND E ON TXWY A; STOPPING SHORT OF RWY 16. I CALLED GND CTL AND ASKED FOR CLRNC TO CROSS RWY 16. I RECEIVED NO REPLY FROM GND CTL. THERE WAS NO ACTIVITY ON THE RWY AND AFTER SOME FURTHER HESITATION CONCLUDED THAT THE CLRNC INCLUDED XING THE END OF RWYS 16L AND 16R. THE COMANCHE SOCIETY HAD SCHEDULED TRAINING SESSIONS AT AN FBO ON SAT AND SUN. WHILE TAXIING TO THE FBO PARKING AREA WHERE THE COMANCHES WERE PARKED; THE GND CTLR CALLED AND DIRECTED ME TO CONTACT THE TWR AFTER PARKING. THE CTLR TOLD ME THAT I HAD CROSSED 2 RWYS WITHOUT A PROPER CLRNC. HE FURTHER COMMENTED THAT NO ONE HAD CONTACTED HIM OR RPTED ANY INCONVENIENCE OR CONCERN TO HIM; BUT THAT I WOULD BE WRITTEN UP FOR THE INCURSIONS. THE MANASSAS ARPT ENVIRONMENT IS A STEP UP FROM THE LEESBURG ARPT WHICH I USE QUITE FREQUENTLY. THE DUBOIS; LEESBURG AND THE MAJORITY OF THE ARPTS I USE ARE NON-TWRED; ADVISORIES ONLY. THE MAJOR ARPTS I USE ARE USUALLY STAFFED WITH 'IN COMMAND' PERSONNEL; THE LANGUAGE AND DELIVERY ARE CLR; CONCISE AND MOSTLY UNDERSTANDABLE. I BELIEVE THIS PROB AROSE BECAUSE I DID NOT ADAPT TO THE TWR CTL ATMOSPHERE AT MANASSAS. THE TWR/GND CTLR GAVE THE IMPRESSION OF BEING UNCOMFORTABLE IN HIS POS. I WAS IN NO RUSH TO TAXI FROM THE RWY TO THE COMANCHE PARKING AREA. I DID NOT KNOWINGLY DO ANYTHING THAT WOULD BE CONSIDERED AN UNSAFE OPERATING PRACTICE.