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I ran 40 on my stock tires most of their life (just replaced them at 36k a few weeks ago) and they were worn evenly. The only uneven wear I had was a few months with a slow leak in the right front. I checked it one day and it was down to 28 pounds. It was more worn on the outside than the left front, so underinflation can have a serious effect on wear.
The new tires were inflated by Discount Tire at 32 lbs. I ran a few tanks through at that pressure. Just upped them to 40 Sunday. We'll see how the next few tanks are.
My '07 Sport Auto is one of the lucky ones. The worst tanks, winter mix of highway and town, are 32 MPG. Highway is generally 38+ with 44.5 being the best so far.
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