How much of an increase in mpg can I expect with overinflated tires?

[garyhgaryh]

I would have to disagree.. Both overinflating and underinflating tires will cause premature wear. It's not just underinflating it.

I've seen pictures of over inflate tires and it's wear after 20k miles from tire companies. The middle budges out. Yes, the steel belts are there and the one in the picture was steel belted.

Gary

Originally Posted by skewbe

Overinflating is not really a cause of premature wear, low pressure is the major cause of that.

It may affect wet handling adversely, so practice. Dry handling effects are good, the sidewalls are nice and stiff and do not flex as much in the corners (them guys that drive on two wheels use like 100 psi).

Them steel belts keep things lined up pretty well so there's no appreciable bulging from overinflating.