CAR ON RWY OF UNCONTROLLED 0F7 FORCES C172 PLT TO ABANDON TOUCH AND GO PRACTICE.

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I WAS FLYING A C172 ON A PRACTICE/PLEASURE FLT TO STAY CURRENT ON TRACKING RADIALS AND AIRWAYS. I WAS FLYING S OF THE OKMULGEE VOR ON V15 OVER LAKE EUFAULA. I DECIDED TO DEVIATE AND MAKE A FEW PRACTICE APCHS AT FOUNTAINHEAD ARPT '0F7.' I CHKED FOR NOTAMS ON MY GARMIN 396 AND MADE A FULL STOP LNDG AND TAXIED OFF THE RWY. AFTER A SHORT BREAK I TOOK OFF TO THE S (RWY 18) AND CIRCLED TO MAKE A FEW 'TOUCH AND GOES' TO PRACTICE SOME XWIND LNDGS. THIS IS AN UNCTLED ARPT SO I 'BROADCAST IN THE BLIND' MY INTENTIONS ON UPWIND; DOWNWIND; BASE AND FINAL. I MADE 1 TOUCH AND GO AND CIRCLED FOR A SECOND ONE. ON SHORT FINAL (1/2 MI) ON RWY 18 I NOTICED A CAR DRIVING N DOWN THE CTRLINE OF THE RWY. I DO NOT KNOW WHERE THE CAR CAME FROM; HOW IT GOT ON THE RWY OR WHY IT WAS COMING DOWN THE CTRLINE; BUT I ABORTED THE LNDG AND PERFORMED A 'GAR' MANEUVER. AS I CIRCLED I NOTICED THE CAR SITTING BY THE SIDE OF THE RWY. I DECIDED TO LEAVE THE AREA AND CONTINUE MY PRACTICE AT ANOTHER ARPT. AFTER I LANDED BACK WHERE MY PLANE IS BASED; I CONTACTED WX BRIEF TO DOUBLE-CHK TO SEE IF THERE WERE ANY NOTAMS THAT I DID NOT PICK UP ON MY GARMIN 396. THE BRIEFER INDICATED THAT 0F7 WAS CLR FOR USE AND HAD NO NOTAMS. IN CLOSING; I REALIZE THIS IS AN UNCTLED ARPT; BUT I BELIEVE THE ARPT IS GATED AND ACCESS IS INTENDED TO BE CTLED. THIS MAY NEED TO BE INVESTIGATED.