1997 LEXUS SC300 Tires Problems

ON JAN 4, 1999, I PURCHASED 4 COOPER TIRES AT GEX TIRE CO, 4041 WEST MERCURY BLVD, HAMPTON, VA 23666. (DOT NUMBER: UPGRCEM339 TIRESIZE: 225/55R-16). ALL 4 TIRES WERE DEFECTIVE AND APPEARED TO HAVE HAD SOME SORT OF MANUFACTURING DEFECTIVES. SHORTLY AFTER THE PURCHASE, THE TIRES BEGAN TO CAUSE UNSTABLE DRIVING CONDITIONS FOR MY CAR WHILE TRAVELING ON LESS-THAN SMOOTH ROADS, IN CURVES, AT SPEEDS AROUND 70 MPH AND ON WET ROADS. IN ADDITION, THE TIRES CAUSED MY GAS MILEAGE TO DECREASE ABOUT 3 TO 4 MPG. AFTER REPLACING THE 4 TIRES ALL OF THE ABOVE CONDITIONS WERE ELIMINATED WITHOUT ANY OTHER REPAIRS. DUE TO ACCELERATED WEAR, 2 OF THE TIRES WERE DEEMED UNSAFE AFTER ABOUT 11,000 MILES. THE REMAINING 2 HAD TO BE REPLACED AT 14,000 MILES. THE FIRST 2 TIRES WERE RETURNED TO GEX TIRE CO WHO PROMISED TO RETURN THEM TO COOPER TIRE FOR ANALYSIS OF THE...