Honestly, over the years of owning my 2012 Mazda5, I've found the rear camber on the rear suspension has eaten a couple different sets of my tires. Granted, I am running stock suspension, but have run 17x7.5 aftermarket wheels with 225/45/17 tires. I think the wider wheels and tires exacerbate the impact of the inherent negative camber, but as that cannot really be adjusted with the stock rear camber arms, it's what I have accepted. I would love to run close to zero negative camber on the rears (between -0.2 and -0.5 degrees).
