2016 Model S 60 rear wheel drive with air suspension on 19" inches... Car came with factory Goodyear Eagle Touring (Foam inside)... My car has about about 16k miles on it... I took the car in today to America's Tire to get a patch repair done on my front driver side due to a nail. Shop guy measured the thread and said that I have uneven wear on my tires... The front measured at 7/32, and the rears a 3/32... I rotated my tires once before at around 6k miles, and at the time the wear was pretty even. Told the guy to go ahead and rotate my tires so I have a good thread on my rear, while I decide on what to do. Any Idea what happen? My driving habit is pretty normal. Floored it once in a while but not all the time. I do drive and set my suspension on low at about 25% of my driving. Now I'm debating if I should replace the two worn with the same tires, or if I should I replace all 4 with a different brand tires that I can get better mileage out of it.