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Haven't post anything for a long time....here is my opinion.
I think the reason the left front tire wear quicker on shoulder is because of driving habit. Most of the people make right turn at a higher speed than left turn, because usually when you make left turn, you stop, and make sure there is no on coming traffic then turn. When turn right, people just turn because there is no need to stop unless there is walking people or traffic light.......agree?
Ok, on our car, the front wheel camber set-up is almost at dead 0 degree, not much negetive camber what so ever. Even you lowered it, you may still get around -0.3 degree of negetive camber because of the multi-link design. So when you take a fast right turn ( fast enough to create any body lean ), the left front outer shoulder of the tire will take a lot of load, and make it wear out quicker.
This is also the reason why correct amount of negetive camber is good for cornering because when body lean, the wheel will be more straight up and down on the ground, and helps grip better.
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