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Anecdotal data from the last 5 years of autoxing that I have done. there is always a sweet spot of traction where the tire holds the best. run it too high, and you can feel the car not gripping the same. same thing with too low of pressure. Especially on street tires, you have a certain range of pressure that is ideal for the tire carcass to maintain its shape during straight line and turning conditions. Too low, and the tire rolls all the way onto the sidewall. Too high, and you can actually see the edges of the tire not get used.
For hypermiling purposes, I cant see this making any difference in your MPG pursuits. the decreased rolling resistance during driving and turning should help, and obviously does make a difference. Only in the most extreme cases of handling needs (accidence avoidance, bad weather conditions, racing) will you approach the limits of adhesion, and it's only during those circumstances that you will need the maximum available grip. Its a game of chance and percentages at that point anyways, so an argument could effectively be made that the difference in tire pressure may not make any difference to the overall out come. Like ABS systems though, sometimes a little more grip and 5 less feet of travel is the difference. its all trade offs really.
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