SMA ACFT RAN OUT OF GAS AND LANDED ON INTERSTATE HIGHWAY AT NIGHT; TWO MILES NORTHEAST OF RIC ARPT.

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AROUND XA00 LCL TIME I VISUALLY CHKED THE TANKS ON SMA X AND CONFIRMED THEY WERE TOPPED OFF. THEN I TOOK A CHKOUT FLT WITH AN INSTR WHICH PUT .4 ON THE CLOCK. AFTER THIS I PICKED UP AN IFR CLRNC AND FLEW TO BADER FIELD; ATLANTIC CITY; WHICH PUT 1.9 HRS ON THE CLOCK SINCE FUELING. AROUND XH45 I DEPARTED ATLANTIC CITY FOR RICHMOND ON WHAT I ESTIMATED TO BE A 2 HR; 10 MIN FLT WITH OVER 3 HRS FUEL ON BOARD. ABOUT 5 MI FROM RICHMOND ARPT I BEGAN TO RUN OUT OF FUEL. I HAD BEEN CLRED TO LAND BUT TOLD APCH CTL THAT I WOULD NEED TO MAKE A LNDG ON I-295 ABOUT 2 MI FROM THE ARPT. I DID THIS W/O ANY CONFLICT TO TFC ON THE ROAD AND W/O INJURING MYSELF; ANYBODY ELSE; OR THE AIRPLANE. THE CLOCK ON THE PLANE INDICATED 4.3 HRS HAD ELAPSED SINCE THE TANKS WERE TOPPED OFF. THE OWNERS MANUAL STATES THAT 4.8 HRS IS THE ENDURANCE AT MAX CRUISE PWR OF 75%. I WAS AT LESS THAN 75% PWR FOR OVER 45 MINS OF MY FLT. THE ONLY CONTRIBUTING FACTOR THAT MIGHT HAVE CAUSED THIS IS A FAIRLY NEW ENG THAT HAD BEEN PUT IN THE AIRPLANE RECENTLY.