I HAD SMELLING A GAS SMELL COMING FROM THE VENTS ON FRIDAY JULY 19TH ANDI TOOK IT TO FIRESTONE FOR A NEW BATTERY AND A OIL CHANGE. I CALLED THE HYUNDAI DEALERSHIP BECAUSE FIRESTONE TOLD ME ABOUT A NEW RECALL FOR THE FIRE PRESSURE FUEL REGULATOR AND THEY HIGHLY SUGGESTED I TAKE IT INTO THEM. I CALLED HYUNDAI AND THEY SAID FOR ME TO BRING IT IN AND I DIDN'T NEED AN APPOINTMENT SO I TOLD THEM I WOULD BE THERE AROUND 3-4PM YESTERDAY. SO I LEFT WORK EARLY, PICKED UP MY CAR FROM FIRESTONE AND HEADED TO THE DEALERSHIP WHICH WAS ABOUT 10 MILES AWAY. I GOT ON I-35 DOING ABOUT 40MPH OR SO BECAUSE OF TRAFFIC. ALL OF A SUDDEN THE CAR NEXT TO ME STARTS HONKING AND WAVING SAYING MY CARS OF FIRE. I TRY TO APPLY THE BREAK BUT THERE WAS NO PRESSURE. MY INSTRUMENT COLUMN LIT UP LIKE THE 4TH OF JULY AND THEN ALMOST IMMEDIATELY SMOKE STARTS COMING IN FROM THE VENTS, DASHBOARD AND FLOOR. SO MY ONLY OPTION IS TO TUCK AND ROLL DOING ABOUT 35-40MPH ON ONE OF THE BUSIEST HIGHWAYS IN AUSTIN. SO I TUCK AND ROLL, PEOPLE ARE STOPPED TO HELP. I SEE MY CAR CONTINUE TO ROLL INTO THE BARRIER AND WHILE CAR BURST INTO FLAMES.