Could it be as simple as over inflation of the tires? If you pump it up too much you begin to get the arch on the tire, and if you have too little pressure it wears more on the outside with a dimple in the middle.
First off, do you rotate your tires??? Second, If your car is dropped then your tires are butterflying. If this is the case then you might want to consider getting a camber kit. If you're car is not dropped then you may just need an alignment.
Tires have not been rotated in 10K miles, but they were NEW then. Whatever is happening is eating up tires fast.
It could be an alignment. In an older car that I had, old springs and struts caused this when the front end lowered, so I was wondering if maybe the same type of thing happens with these cars when the get too old. Also, I have seen alignments eat up tires, but never both on the inside like this. It steers straight, but I know that doesn't mean that it is aligned.
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