EXCESSIVE TIRE WEAR ON 2006 BMW 330I. FIRESTONE SAYS THAT THE CUPPING OF THE TIRES (STARTING AT ABOUT 8K MILES) CAUSES LESS TRACTION ON THE ROAD AND WILL GET WORSE. THE TIRES STARTED TO MAKE LOAD NOISE AT ABOUT 8K MILES AND THEY NOW HAVE 13K MILES ON THEM AND THE NOISE LEVEL IS VERY BAD. I HAVE CONTACTED BMW SEVERAL TIMES AND THEY SAY THAT THEY WILL CONSIDER REPLACING THE TIRES ONLY IF I WILL AGREE TO PAY HALF OF THE COST(ABOUT $600 MY COST FOR 4 TIRES). I FEEL THAT THIS IS A SAFETY ISSUE ONLY WITH THIS BRAND AND TYPE OF TIRE AND FIRESTONE NEEDS TO REPLACE THE TIRES. THE TIRES IN QUESTION ARE BRIDGESTONE TURANZA EL42, SIZE 205/55/R16 RUN FLATS. THIS CUPPING ON THESE TIRES CAUSES THE TIRE TO LOOSE CONTACT WITH THE ROAD AND MAY CAUSE AN ACCIDENT ON WET ROADS. *NM