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

[skewbe]

sigh, we can go through this all again, or we can re-read the previous debates:

http://www.gassavers.org/showthread.php?t=1727#6

People here are reporting even tire wear with lots of pressure and 10s of thousands of miles. Many of the overinflated tires here are pretty skinny to begin with and being steel belted radials they seem to hold their shape better with extra pressure.

You have steel belts going in every direction, if it were to bulge out in just one part of the middle tread it would have to pull in from another part of the middle tread, but that part of the tread also has extra pressure forcing it into the shape defined by the steel belts.

I know it seems counter-intuitive and unconventional, maybe the center bulge theorists are a hold over from before steel belted radials? I don't have enough miles to consider myself a first-hand expert, just trying to think it through in the mean time and make sense out of the reports of "overinflating works".