I've read in several place in these forums, and have also seen it for myself with my Insight, about the higher levels of wear on the outside of the tires. In fact, when I got new tires after accumulating 42,000 miles on the original set that came with the car, the outside edges of the tires were nearly bald while the middle of the tires had at least a few millimeters of tread left. I've always kept my pressures at or above the manufacturer's recommendations so I don't think the wear could be attributed to underinflation (which I have experienced in previous vehicles I've owned where I've kept the tires a little underinflated to improve handling a bit) and in the past when I've overinflated tires the middle has worn more than the edges, which is what I expected I would see but never have. My question, which maybe someone in this forum can answer, concerns the setup of the suspension. Could it be something like the camber (maybe the top of the tire is canted out past where the bottom of the tire is located, putting more pressure on the outer tire surface) or toe-in (which is supposed to be zero for Insights if I remember correctly, where normally I believe most cars carry a small bit of toe-in, at least in the front) which is having more of an effect on tire wear than the inflation value?