My 2011 550GT needed a quart at 9K. Got an Oil and Filter change at 13K and needed another quart at 22K. So it seems about every 9K after an oil change to me. I have Goodyear Excellence 245-40R20's on the front and 275-35R20's on the rear of my RWD GT (So obviously no rotations for me) and had a little extra inside edge wear on both of the rears at 20K miles, but one tire had a nail and one tire had a screw so both were replaced under my Tire and Wheel warranty right before I needed to replace them anyway. Those guys lose a ton of money on me. I'm surprised I still qualify for purchases. I did do a 4 wheel alignment ($190) and will see if that fixes future issues, but I won't know for a while. That was only 2 months ago in December. LOVE my GT though!
Supreme Omnipotent Bobohead-Currently seeking time off for good behavior!