PLT OF SMA GA ACFT MADE AN OFF ARPT FORCED LNDG DUE TO FUEL STARVATION RESULTING IN NO DAMAGE TO THE ACFT.

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I WAS TO FLY AN SMA FROM 3KM TO ABR TO PICK UP PAX. IT WAS PLT SVC. I FILED IFR; BUT DID NOT PICK UP THE CLRNC AND DID NOT PLAN TO FLY IMC. I PLANNED 3:40 TO ABR NON STOP. I PERSONALLY CHKED THE AIRPLANE OUT (PAPERS; ETC) THE NIGHT BEFORE; AND SAW THAT IT HAD BEEN TOPPED (75 GALLONS). THE MORNING OF THE TRIP I AGAIN VISUALLY CHKED THE FUEL WITH A LADDER AND SEVERAL WITNESSES. IT WAS FULL. AFTER AN UNEVENTFUL FLT; WHEN I WAS 15 MI SE OF ABR; THE ENG QUIT. BECAUSE OF THE WAY IT SPUTTERED; ETC; I KNEW IT WAS OUT OF FUEL. I HAD FLOWN EXACTLY 3:35 MINS. AT THE TIME OF FAILURE; THE GAUGES SHOWED 1/8 L AND NEARLY 1/2 R. THIS WAS CONSISTENT WITH MY FUEL USE BECAUSE I HAD BURNED THE L SIDE DOWN TO TRIM THE AIRPLANE. AFTER I LANDED ON A ROAD; I CHKED THE TANKS VISUALLY. BOTH WERE DRY WITH THE BLADDERS WADDED UP PRETTY BAD. THIS IS WHY THE GAUGES HAD SHOWN FUEL. WITHIN 10 MINS OF LNDG (XA20) I HAD CALLED FSS AND THE LCL FSDO. I PUT 15 GALLONS OF 100LL INTO THE PLANE AND WITH THE FSDO INSPECTOR'S PERMISSION; FLEW THE PLANE TO ABR. A MECH AT ABR REMOVED THE WING PANELS AND STRAIGHTENED OUT AND RESNAPPED THE BLADDERS INTO PLACE AND INSPECTED THE CAPS. HE FOUND NO OBVIOUS PROBS. HE; THE FSDO INSPECTOR; AND I ALL FELT THE PLANE WAS SAFE TO FLY HOME WITH ONE OR MORE STOPS TO CHK FUEL CONSUMPTION. THE FUEL CONSUMPTION ON THE RETURN TRIP WAS NORMAL. ALTHOUGH WHEN I LOOKED AT THE CAPS AFTER MY FORCED LNDG THEY SEEMED TO BE SEALED PROPERLY; I SUSPECT THE R FUEL CAP AS HAVING LEAKED MY 28 GALLON RESERVE OUT. THERE WAS FRESH FUEL STAIN ON THE R SIDE OF THE FUSELAGE. IT IS ALSO POSSIBLE THE BLADDERS WERE WADDED UP BEFORE THE FUELING AND I DID NOT GET A FULL 75 GALLONS USABLE PUT ON. IN ADDITION; THE OWNER OF THE AIRPLANE; WHOM I DID NOT KNOW; TOLD ME THAT HE HAD HAD A FUEL SIPHONING PROB WITH THE R CAP BEFORE; AND HAD HIS WIFE NOT ALERTED HIM; HE WOULD NOT HAVE KNOWN IT. HE TOLD ME THE CAP HAD TO BE PUSHED DOWN AND LATCHED 'JUST SO' OR IT WOULD LEAK. HE TOLD ME THIS AFTER THE INCIDENT.